• Q1: I would, yers. because tracing the picture makes a lot of
  pointless points and the from is easy to rebuild (using bezier tool,
  shortcut "b")
• Q2: for me the svg is the same dimension as imported in OpenSCAD. I
  found in your svg file that everything was set to "px". But you have to
  switch to "mm". I guess this is the reason for the strange Dimensions.
  see another video in attachment
• Q3: there are 2 objects, the black "line" and the red fillin. Normally
  this are two parts of one object (fill and stroke) but in your svg this
  are two objects filled: one filled with black (looking like a line but its
  a filled path), one filled with red. It seems that OpenSCAD used only the
  black one (maybe because of intersections?). For this request you should
  use only one filled object (don't use stroke for filled objects because it
  changes the dimensions).
• Q4: don't know

Am Mi., 21. Juli 2021 um 16:52 Uhr schrieb Terry terrypingm@gmail.com:

• Q1: I would, yers. because tracing the picture makes a lot of
  pointless points and the from is easy to rebuild (using bezier tool,
  shortcut "b")
• Q2: for me the svg is the same dimension as imported in OpenSCAD. I
  found in your svg file that everything was set to "px". But you have to
  switch to "mm". I guess this is the reason for the strange Dimensions.
  see another video
  https://share.icloud.com/photos/0WUOa2bATDcr9iuXLNkmf4KjA
• Q3: there are 2 objects, the black "line" and the red fillin. Normally
  this are two parts of one object (fill and stroke) but in your svg this
  are two objects filled: one filled with black (looking like a line but its
  a filled path), one filled with red. It seems that OpenSCAD used only the
  black one (maybe because of intersections?). For this request you should
  use only one filled object (don't use stroke for filled objects because it
  changes the dimensions).
• Q4: don't know

Am Mi., 21. Juli 2021 um 16:52 Uhr schrieb Terry terrypingm@gmail.com:

I would have a completly different approach; assuming this is a oneoff for
personal use, and this is "just" the endcover for the tool shown,
presumably with some axis in the middle.

Tolerances need not be 0.1 mm ... size and fit and glue would make me
choose to measure it with calipers, draw a OpenSCAD shape "rounded
rectangle", possibly scaled if it is "elliptical". I'd only need to be
within a mm or two, oversized, and then I'd file/sandpaper it to fit.

Msquare

ons. 21. jul. 2021 16.52 skrev Terry terrypingm@gmail.com:

Hi Terry,

I've never found any 'auto trace'  in any of the low cost common drawing
packages to work good enough to be useful . For simple shapes, manually
trace it in your drawing program. For this simple shape, I would scan
the cut off end of the drill - hold it on to the flat bed scanner, then
print it out on paper and  cut out the shape. If you haven't a scanner,
then trace around it, (or do a 'brass rubbing' ) and cut out the shape.
Then, build up that shape with overlapping circles,squares, whatever in
openscad. Easy to check if near enough by holding the paper over the
screen. Linear extrude a couple of mm, save stl, and print*. after a few
iterations you'll get it to fit. It looks like a hull between a couple
of circles, so I'm pretty sure Michael's approach would work fine, too.

Never underestimate the power of cad - cardboard aided design.

*You could start by printing to paper, and overlay on the original, if
you think you will be wasting filament. (make sure you get the scaling
right, dpi, etc.

On 21/07/2021 15:52, Terry wrote:

On Wednesday 21 July 2021 12:41:13 Ray West wrote:

Chuckle. You never cease to amaze or amuse me.

Cheers, Gene Heskett

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Genes Web page http://geneslinuxbox.net:6309/gene

Thanks all, those are very helpful. Any later similar project will
benefit!

My first print did indeed need a little sanding but does the job.
https://www.dropbox.com/s/gd84weo34qin8df/Cover-1.jpg?raw=1

I lost some symmetry because my saw cut was not precisely at right
angles to the.

I could have done the job in a matter of minutes using thin
aluminium (I have lots of scraps), or even cardboard, as there's
no need for any strength. But it was mainly a learning exercise.

Thanks for that video re units Deitrich. I'll try those px to mm
changes shortly. I may be back for more Inkscape help in a few
days, as I find it hard going. Although perhaps I should do that
via the Inkscape forum if you use that?

Terry

====================

On Wed, 21 Jul 2021 17:25:02 +0200, you wrote:

On 7/21/2021 7:52 AM, Terry wrote:

It sounds like you're building a model and then trying to force the
model to be the right dimensions, rather than building the model at the
right dimensions in the first place.

I'm not enough of an Inkscape user to know exactly how to do it, but I
expect that you can design in Inkscape in the right scale, and that that
carry through to OpenSCAD and thence the STL without requiring any
special scaling.

It looks like that's an oval - that is, two half-circles with straight
segments between them.  If so, I'd stay entirely in OpenSCAD, either
hulling two circles or unioning two circles with a square, and then
extruding.

If it's not an oval, if it's a more complex curve, I'd still do it
entirely in OpenSCAD, but with Bezier curves.  I have my own
implementation, but you can find them in BOSL2.

This looks like a very small part.  Dont' forget that you can print and
test-fit it quickly.  If you want to be extra fast, print a one or two
layer version.

my answer didn't arrive..? trying the 3rd time..

Am Mi., 21. Juli 2021 um 17:25 Uhr schrieb dpa sc@pankd.de:

On Wed, 21 Jul 2021 21:15:43 +0200, you wrote:

Did you post a second time Deitrich?

I confess to continuing confusion about the flow of posts here. I
posted a (short) reply thanking all respondents, and attaching a
JPG. But, as usual, I don't see it myself in my incoming mail.
Apart from the much discussed gmail issue, in this case it may be
because of this separate automated email

"The message is being held because:
The message is larger than the 1250 KB maximum size
Either the message will get posted to the list, or you will
receive notification of the moderator's decision."

Checking, I see that my JPG was 1.3 MB. So I guess I should post
links only in future for high res images.

Anyway, I'll take the opportunity of repeating yesterday's reply
again below, with no attachment.

Thanks all, those are very helpful. Any later similar project will
benefit!

My first print did indeed need a little sanding but does the job.
https://www.dropbox.com/s/gd84weo34qin8df/Cover-1.jpg?raw=1

I lost some symmetry because my saw cut was not precisely at right
angles to the.

I could have done the job in a matter of minutes using thin
aluminium (I have lots of scraps), or even cardboard, as there's
no need for any strength. But it was mainly a learning exercise.

Thanks for that video re units Deitrich. I'll try those px to mm
changes shortly. I may be back for more Inkscape help in a few
days, as I find it hard going. Although perhaps I should do that
via the Inkscape forum if you use that?

Terry