Apparently according to wikipedia <https://en.wikipedia.org/wiki/Countersink> , ISO Metric & Imperial screw countersink are 90 degrees, while American UN is 82d. I need a hole to wall mount a holder, but it needs to be flush for an item to slide into the holder. Hence a countersunk screw. Ideally one model that can be used world wide. A ISO screw in a 82d hole is going to sit proud, unless a smaller screw is used. A UN screw in a 90d hole just has less surface contact, but at the thinner part of the hole - so less secure. Anyone know the specification of screw head size for a given screw size, ie the red bit: <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png> Something like BOLTS, but SCREWS? It's not holding a bridge, maybe I'm over thinking this? ----- Newly minted Admin - PM me if you need anything, or if I've done something stupid... Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above. The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out! -- View this message in context: http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728.html Sent from the OpenSCAD mailing list archive at Nabble.com.

This company gives dimensions of all the screws it sells, e.g.: http://www.pts-uk.com/Products/Woodscrews_Pozi_Countersunk_Woodscrews_Metric_A2/A79973025 On 16 January 2016 at 06:49, MichaelAtOz <oz.at.michael@gmail.com> wrote: > Apparently according to wikipedia > <https://en.wikipedia.org/wiki/Countersink> , ISO Metric & Imperial screw > countersink are 90 degrees, while American UN is 82d. > I need a hole to wall mount a holder, but it needs to be flush for an item > to slide into the holder. > Hence a countersunk screw. Ideally one model that can be used world wide. > > A ISO screw in a 82d hole is going to sit proud, unless a smaller screw is > used. > A UN screw in a 90d hole just has less surface contact, but at the thinner > part of the hole - so less secure. > > Anyone know the specification of screw head size for a given screw size, ie > the red bit: > <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png> > > Something like BOLTS, but SCREWS? > > It's not holding a bridge, maybe I'm over thinking this? > > > > > ----- > Newly minted Admin - PM me if you need anything, or if I've done something > stupid... > > Unless specifically shown otherwise above, my contribution is in the > Public Domain; to the extent possible under law, I have waived all > copyright and related or neighbouring rights to this work. Obviously > inclusion of works of previous authors is not included in the above. > > The TPP is no simple “trade agreement.” Fight it! > http://www.ourfairdeal.org/ time is running out! > -- > View this message in context: > http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

 Apparently according to  wikipedia
 <https://en.wikipedia.org/wiki/Countersink>  , ISO Metric & Imperial
 screw
 countersink are 90 degrees, while American UN is 82d.
 I need a hole to wall mount a holder, but it needs to be flush for
 an item
 to slide into the holder.
 Hence a countersunk screw. Ideally one model that can be used world
 wide.

 A ISO screw in a 82d hole is going to sit proud, unless a smaller
 screw is
 used.
 A UN screw in a 90d hole just has less surface contact, but at the
 thinner
 part of the hole - so less secure.

 Anyone know the specification of screw head size for a given screw
 size, ie
 the red bit:
 <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png>

 Something like BOLTS, but SCREWS?

 It's not holding a bridge, maybe I'm over thinking this?




 -----
 Newly minted Admin - PM me if you need anything, or if I've done
 something stupid...

 Unless specifically shown otherwise above, my contribution is in the
 Public Domain; to the extent possible under law, I have waived all
 copyright and related or neighbouring rights to this work. Obviously
 inclusion of works of previous authors is not included in the above.

 The TPP is no simple “trade agreement.”   Fight it!
 http://www.ourfairdeal.org/   time is running out!
 --
 View this message in context:
 http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728.html
 Sent from the OpenSCAD mailing list archive at Nabble.com.

 _______________________________________________
 OpenSCAD mailing list
 Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org>
 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

I normally just measure the screws I have at hand (shaft diameter, head diameter, head width) and put notes in the OpenSCAD file as a comment (where purchased, exact screw dimensions, etc.) That way anyone on thingiverse who wants to build it can order something that should be very similar. I also put all hardware-related things prominently marked as variables at the top of the file so that it is easy to change. I don't think you are going to find a universal screw that is readily available worldwide; for most common applications it doesn't matter, for niche and critical applications it is a special-order over the internet anyway. For example (in the US) wood screws for countersinking, even if they are the same shaft diameter, often have different head profiles based on different manufacturers. For 3D printing countersunk holes, it has been problematic - different printers can sometimes be off by a millimeter, especially on interior holes; this can make countersunk screws not sit flush to the surface (using the same model, same screws, and different 3D printers). Any commercial DIY products include the screws for this reason. On 1/16/2016 3:38 AM, nop head wrote: > This company gives dimensions of all the screws it sells, e.g.: > http://www.pts-uk.com/Products/Woodscrews_Pozi_Countersunk_Woodscrews_Metric_A2/A79973025 > > On 16 January 2016 at 06:49, MichaelAtOz <oz.at.michael@gmail.com > <mailto:oz.at.michael@gmail.com>> wrote: > > Apparently according to wikipedia > <https://en.wikipedia.org/wiki/Countersink> , ISO Metric & Imperial > screw > countersink are 90 degrees, while American UN is 82d. > I need a hole to wall mount a holder, but it needs to be flush for > an item > to slide into the holder. > Hence a countersunk screw. Ideally one model that can be used world > wide. > > A ISO screw in a 82d hole is going to sit proud, unless a smaller > screw is > used. > A UN screw in a 90d hole just has less surface contact, but at the > thinner > part of the hole - so less secure. > > Anyone know the specification of screw head size for a given screw > size, ie > the red bit: > <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png> > > Something like BOLTS, but SCREWS? > > It's not holding a bridge, maybe I'm over thinking this? > > > > > ----- > Newly minted Admin - PM me if you need anything, or if I've done > something stupid... > > Unless specifically shown otherwise above, my contribution is in the > Public Domain; to the extent possible under law, I have waived all > copyright and related or neighbouring rights to this work. Obviously > inclusion of works of previous authors is not included in the above. > > The TPP is no simple “trade agreement.” Fight it! > http://www.ourfairdeal.org/ time is running out! > -- > View this message in context: > http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

 Apparently according to  wikipedia
 <https://en.wikipedia.org/wiki/Countersink>  , ISO Metric & Imperial
 screw
 countersink are 90 degrees, while American UN is 82d.
 I need a hole to wall mount a holder, but it needs to be flush for
 an item
 to slide into the holder.
 Hence a countersunk screw. Ideally one model that can be used world
 wide.

 A ISO screw in a 82d hole is going to sit proud, unless a smaller
 screw is
 used.
 A UN screw in a 90d hole just has less surface contact, but at the
 thinner
 part of the hole - so less secure.

 Anyone know the specification of screw head size for a given screw
 size, ie
 the red bit:
 <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png>

 Something like BOLTS, but SCREWS?

 It's not holding a bridge, maybe I'm over thinking this?




 -----
 Newly minted Admin - PM me if you need anything, or if I've done
 something stupid...

 Unless specifically shown otherwise above, my contribution is in the
 Public Domain; to the extent possible under law, I have waived all
 copyright and related or neighbouring rights to this work. Obviously
 inclusion of works of previous authors is not included in the above.

 The TPP is no simple “trade agreement.”   Fight it!
 http://www.ourfairdeal.org/   time is running out!
 --
 View this message in context:

 _______________________________________________
 OpenSCAD mailing list
 Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org>
 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

May be it would be a good idea to put imortant screw sizes into well-commented variables, so anyone can adjust them to the screws he has? 16 янв. 2016 г. 3:54 PM пользователь "Ezra Reynolds" <shadowwynd@gmail.com> написал: > I normally just measure the screws I have at hand (shaft diameter, head > diameter, head width) and put notes in the OpenSCAD file as a comment > (where purchased, exact screw dimensions, etc.) That way anyone on > thingiverse who wants to build it can order something that should be very > similar. I also put all hardware-related things prominently marked as > variables at the top of the file so that it is easy to change. > > I don't think you are going to find a universal screw that is readily > available worldwide; for most common applications it doesn't matter, for > niche and critical applications it is a special-order over the internet > anyway. > > For example (in the US) wood screws for countersinking, even if they are > the same shaft diameter, often have different head profiles based on > different manufacturers. For 3D printing countersunk holes, it has been > problematic - different printers can sometimes be off by a millimeter, > especially on interior holes; this can make countersunk screws not sit > flush to the surface (using the same model, same screws, and different 3D > printers). > > Any commercial DIY products include the screws for this reason. > > On 1/16/2016 3:38 AM, nop head wrote: > >> This company gives dimensions of all the screws it sells, e.g.: >> >> http://www.pts-uk.com/Products/Woodscrews_Pozi_Countersunk_Woodscrews_Metric_A2/A79973025 >> >> On 16 January 2016 at 06:49, MichaelAtOz <oz.at.michael@gmail.com >> <mailto:oz.at.michael@gmail.com>> wrote: >> >> Apparently according to wikipedia >> <https://en.wikipedia.org/wiki/Countersink> , ISO Metric & Imperial >> screw >> countersink are 90 degrees, while American UN is 82d. >> I need a hole to wall mount a holder, but it needs to be flush for >> an item >> to slide into the holder. >> Hence a countersunk screw. Ideally one model that can be used world >> wide. >> >> A ISO screw in a 82d hole is going to sit proud, unless a smaller >> screw is >> used. >> A UN screw in a 90d hole just has less surface contact, but at the >> thinner >> part of the hole - so less secure. >> >> Anyone know the specification of screw head size for a given screw >> size, ie >> the red bit: >> <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png> >> >> Something like BOLTS, but SCREWS? >> >> It's not holding a bridge, maybe I'm over thinking this? >> >> >> >> >> ----- >> Newly minted Admin - PM me if you need anything, or if I've done >> something stupid... >> >> Unless specifically shown otherwise above, my contribution is in the >> Public Domain; to the extent possible under law, I have waived all >> copyright and related or neighbouring rights to this work. Obviously >> inclusion of works of previous authors is not included in the above. >> >> The TPP is no simple “trade agreement.” Fight it! >> http://www.ourfairdeal.org/ time is running out! >> -- >> View this message in context: >> >> http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728.html >> Sent from the OpenSCAD mailing list archive at Nabble.com. >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> >> >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

 Apparently according to  wikipedia
 <https://en.wikipedia.org/wiki/Countersink>  , ISO Metric & Imperial
 screw
 countersink are 90 degrees, while American UN is 82d.
 I need a hole to wall mount a holder, but it needs to be flush for
 an item
 to slide into the holder.
 Hence a countersunk screw. Ideally one model that can be used world
 wide.

 A ISO screw in a 82d hole is going to sit proud, unless a smaller
 screw is
 used.
 A UN screw in a 90d hole just has less surface contact, but at the
 thinner
 part of the hole - so less secure.

 Anyone know the specification of screw head size for a given screw
 size, ie
 the red bit:
 <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png>

 Something like BOLTS, but SCREWS?

 It's not holding a bridge, maybe I'm over thinking this?




 -----
 Newly minted Admin - PM me if you need anything, or if I've done
 something stupid...

 Unless specifically shown otherwise above, my contribution is in the
 Public Domain; to the extent possible under law, I have waived all
 copyright and related or neighbouring rights to this work. Obviously
 inclusion of works of previous authors is not included in the above.

 The TPP is no simple “trade agreement.”   Fight it!
 http://www.ourfairdeal.org/   time is running out!
 --
 View this message in context:

 _______________________________________________
 OpenSCAD mailing list
 Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org>

Countersunk screws are particularly tricky with 3D printed parts. If they are vertical then you need to take into account the staircase effect if you want them to sit flush, which depends on the layer height. I always use poly_cylinders when I need accurate holes but this would need a poly_cone. In practice they don't have infinitely sharp edges so you also need about 1mm of straight sided counter-bore above the cone. If they are horizontal then it gets even more complicated with the staircase and they tend to split the layers apart if you tighten them too much. For that reason I use counter_bored pan heads in plastic parts. On 16 January 2016 at 13:04, Mihail Vasiliev <mickvav@gmail.com> wrote: > May be it would be a good idea to put imortant screw sizes into > well-commented variables, so anyone can adjust them to the screws he has? > 16 янв. 2016 г. 3:54 PM пользователь "Ezra Reynolds" <shadowwynd@gmail.com> > написал: > > I normally just measure the screws I have at hand (shaft diameter, head >> diameter, head width) and put notes in the OpenSCAD file as a comment >> (where purchased, exact screw dimensions, etc.) That way anyone on >> thingiverse who wants to build it can order something that should be very >> similar. I also put all hardware-related things prominently marked as >> variables at the top of the file so that it is easy to change. >> >> I don't think you are going to find a universal screw that is readily >> available worldwide; for most common applications it doesn't matter, for >> niche and critical applications it is a special-order over the internet >> anyway. >> >> For example (in the US) wood screws for countersinking, even if they are >> the same shaft diameter, often have different head profiles based on >> different manufacturers. For 3D printing countersunk holes, it has been >> problematic - different printers can sometimes be off by a millimeter, >> especially on interior holes; this can make countersunk screws not sit >> flush to the surface (using the same model, same screws, and different 3D >> printers). >> >> Any commercial DIY products include the screws for this reason. >> >> On 1/16/2016 3:38 AM, nop head wrote: >> >>> This company gives dimensions of all the screws it sells, e.g.: >>> >>> http://www.pts-uk.com/Products/Woodscrews_Pozi_Countersunk_Woodscrews_Metric_A2/A79973025 >>> >>> On 16 January 2016 at 06:49, MichaelAtOz <oz.at.michael@gmail.com >>> <mailto:oz.at.michael@gmail.com>> wrote: >>> >>> Apparently according to wikipedia >>> <https://en.wikipedia.org/wiki/Countersink> , ISO Metric & Imperial >>> screw >>> countersink are 90 degrees, while American UN is 82d. >>> I need a hole to wall mount a holder, but it needs to be flush for >>> an item >>> to slide into the holder. >>> Hence a countersunk screw. Ideally one model that can be used world >>> wide. >>> >>> A ISO screw in a 82d hole is going to sit proud, unless a smaller >>> screw is >>> used. >>> A UN screw in a 90d hole just has less surface contact, but at the >>> thinner >>> part of the hole - so less secure. >>> >>> Anyone know the specification of screw head size for a given screw >>> size, ie >>> the red bit: >>> <http://forum.openscad.org/file/n15728/400px-Screw_head_cs.png> >>> >>> Something like BOLTS, but SCREWS? >>> >>> It's not holding a bridge, maybe I'm over thinking this? >>> >>> >>> >>> >>> ----- >>> Newly minted Admin - PM me if you need anything, or if I've done >>> something stupid... >>> >>> Unless specifically shown otherwise above, my contribution is in the >>> Public Domain; to the extent possible under law, I have waived all >>> copyright and related or neighbouring rights to this work. Obviously >>> inclusion of works of previous authors is not included in the above. >>> >>> The TPP is no simple “trade agreement.” Fight it! >>> http://www.ourfairdeal.org/ time is running out! >>> -- >>> View this message in context: >>> >>> http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728.html >>> Sent from the OpenSCAD mailing list archive at Nabble.com. >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> >>> >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> >>> >>> >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> >>> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > >

Thanks all. For posterity this <http://file.seekpart.com/keywordpdf/2011/3/22/20113228573866.pdf> gives dimensions for metric & a UN (I'm assuming from the 82d angle) countersunk screws of various types as the DIN standards. ----- Newly minted Admin - PM me if you need anything, or if I've done something stupid... Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above. The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out! -- View this message in context: http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728p15740.html Sent from the OpenSCAD mailing list archive at Nabble.com.

This is a handy reference too, one you have a reference - click in the boxes. http://www.fasteners.eu/standards ----- Newly minted Admin - PM me if you need anything, or if I've done something stupid... Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above. The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out! -- View this message in context: http://forum.openscad.org/Anyone-done-anything-on-countersunk-screw-holes-tp15728p15741.html Sent from the OpenSCAD mailing list archive at Nabble.com.