hello! probable offtopic, but since i do the whole thing in openscad maybe not.... i am still on my hands free doorlatch thing ( https://www.thingiverse.com/thing:4233677) and specifically how i close the jaw around the knob.... at the moment i am using screws, but since all hardware shops are closed (we are allowed 400 m around our habitations anyway....), i only have either 15mm screws or 40..... and i am not really a metal worker guy, my tries to shorten the 40mm ended bloodily..... either way i position the screws, either , once finished its smooth for the hands, but hell to mount playing around with a bit and a pincer to get the screw closed in the small space between door and handle, or i can screw the thing in easy and nice, but the protruding screws are problematic when a certain medic tries to pass the doors in a hurry (my wife)..... so if any one has any idea on how to keep the pressure in the claw on the knob, without hassling at mount time (i have only limited allowed time in the disaster area....) and without impairing its functionality..... -- ciao Bruno =========================================== http://nohkumado.eu/, <http://bboett.free.fr>http://aikido.nohkumado.eu/, <http://bboett.free.fr> http://aikido.zorn.free.fr

1. Metal is much easier to sterilize than plastic. I'm not sure this thing provides any protection. Even without lysol spray or hand sanitizer, Id feel better about wiping down the metal handle with soap/water than the attachment, in terms of biosafety. 2. Assuming you still want to persue this: 1. Can you order screws? 2. Why not duct tape? 3. there are lots of ways to cut screws, but most of them involve some way to hold the screw securely. Depending on the size of the bolt, some electricians wire strippers have bolt cutter attachments. DO you have a vise? Do you have a file? A hacksaw? On Sat, Mar 21, 2020 at 5:27 AM Bruno Boettcher <bboett@gmail.com> wrote: > hello! > > probable offtopic, but since i do the whole thing in openscad maybe not.... > i am still on my hands free doorlatch thing ( > https://www.thingiverse.com/thing:4233677) and specifically how i close > the jaw around the knob.... > > at the moment i am using screws, but since all hardware shops are closed > (we are allowed 400 m around our habitations anyway....), i only have > either 15mm screws or 40..... and i am not really a metal worker guy, my > tries to shorten the 40mm ended bloodily..... > > either way i position the screws, either , once finished its smooth for > the hands, but hell to mount playing around with a bit and a pincer to get > the screw closed in the small space between door and handle, or i can screw > the thing in easy and nice, but the protruding screws are problematic when > a certain medic tries to pass the doors in a hurry (my wife)..... > > so if any one has any idea on how to keep the pressure in the claw on the > knob, without hassling at mount time (i have only limited allowed time in > the disaster area....) and without impairing its functionality..... > > -- > ciao > Bruno > > =========================================== > http://nohkumado.eu/, <http://bboett.free.fr>http://aikido.nohkumado.eu/, > <http://bboett.free.fr> > http://aikido.zorn.free.fr > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

1. Metal is much easier to sterilize than plastic. I'm not sure this
thing provides any protection. Even without lysol spray or hand sanitizer,
Id feel better about  wiping down the metal handle with soap/water than the
attachment, in terms of biosafety.
2. Assuming you still want to persue this:
   1. Can you order screws?
   2. Why not duct tape?
   3. there are lots of ways to cut screws, but most of them involve
   some way to hold the screw securely. Depending on the size of the bolt,
   some electricians wire strippers have bolt cutter attachments. DO you have
   a vise? Do you have a file? A hacksaw?

well the point is that it doesn't need to be sterilized, having the sleeves contaminated is, at least in this case, way less impacting than the hands. I tried ordering, but was told that i had to prepare for 2 weeks of waiting time..... hmm for duct tape i would have to redesign this completely, and if i manage to tape it solidly enough, it will be hell to get off whenever this is over.... :) and as said, i have a hobbyist vise, and just managed to cut my self with the saw when trying to cut those screws :D having my vision going down due to age + my dyspraxia might be an explanation, lack of mechanical talent another :D but in the meantime i solved it, i found in my capharnaum a full box of inox M6 screws with hex head and assorted flange-nuts, so i will go with that one, had to make the screw part parametrable in my design, a good exercice :D next i have to try that children stuff, there's some redundancy in my code that i think could be solved with that.... ciao Bruno Am Sa., 21. März 2020 um 13:53 Uhr schrieb Ari Diacou <ari.diacou@gmail.com >: > > 1. Metal is much easier to sterilize than plastic. I'm not sure this > thing provides any protection. Even without lysol spray or hand sanitizer, > Id feel better about wiping down the metal handle with soap/water than the > attachment, in terms of biosafety. > 2. Assuming you still want to persue this: > 1. Can you order screws? > 2. Why not duct tape? > 3. there are lots of ways to cut screws, but most of them involve > some way to hold the screw securely. Depending on the size of the bolt, > some electricians wire strippers have bolt cutter attachments. DO you have > a vise? Do you have a file? A hacksaw? > > > On Sat, Mar 21, 2020 at 5:27 AM Bruno Boettcher <bboett@gmail.com> wrote: > >> hello! >> >> probable offtopic, but since i do the whole thing in openscad maybe >> not.... >> i am still on my hands free doorlatch thing ( >> https://www.thingiverse.com/thing:4233677) and specifically how i close >> the jaw around the knob.... >> >> at the moment i am using screws, but since all hardware shops are closed >> (we are allowed 400 m around our habitations anyway....), i only have >> either 15mm screws or 40..... and i am not really a metal worker guy, my >> tries to shorten the 40mm ended bloodily..... >> >> either way i position the screws, either , once finished its smooth for >> the hands, but hell to mount playing around with a bit and a pincer to get >> the screw closed in the small space between door and handle, or i can screw >> the thing in easy and nice, but the protruding screws are problematic when >> a certain medic tries to pass the doors in a hurry (my wife)..... >> >> so if any one has any idea on how to keep the pressure in the claw on the >> knob, without hassling at mount time (i have only limited allowed time in >> the disaster area....) and without impairing its functionality..... >> >> -- >> ciao >> Bruno >> >> =========================================== >> http://nohkumado.eu/, <http://bboett.free.fr>http://aikido.nohkumado.eu/, >> <http://bboett.free.fr> >> http://aikido.zorn.free.fr >> _______________________________________________ >> 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 > -- ciao Bruno =========================================== http://nohkumado.eu/, <http://bboett.free.fr>http://aikido.nohkumado.eu/, <http://bboett.free.fr> http://aikido.zorn.free.fr

You can make a wedging clamp in a couple of different ways. A simple example is print a solid tapered tube, slide it over the door handle, and then drive a wedge in-between it and the handle. Here's an example of someone using wedges for holding wood. The same principle should be viable for you. https://www.youtube.com/watch?v=iGVz38gQsWA If you really want to have a clam shell design, you can also use tapered rings for clamping force - a bit like a collet works. -- Sent from: http://forum.openscad.org/