Drawing 100 tooth HTD 3M timing pulley

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ljoets
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Joined: Mon May 11, 2015 7:09 pm

Drawing 100 tooth HTD 3M timing pulley

Postby ljoets » Wed May 16, 2018 1:57 pm

Hi all,
I have to draw a 100 tooth HTD 3M timing pulley and export it in SVG format (I just need a top view).
I found tooth profile characteristics here : https://www.solidrop.net/photo-7/cnc-ma ... ulleys.jpg
Is there a tip to draw it with FreeCAD ?
I am able to draw one teeth, but I don't know how to proceed after that.
What should be the correct way to do that ?
Thanks !
DeepSOIC
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby DeepSOIC » Wed May 16, 2018 2:24 pm

Draft Array (change it into polar using properties). Then, you can try exporting it as is. If you want to extrude it, you'll need to stitch it together. Maybe Fuse property of draft array will help, but if not, Part JoinConnect can.
ljoets
Posts: 14
Joined: Mon May 11, 2015 7:09 pm

Re: Drawing 100 tooth HTD 3M timing pulley

Postby ljoets » Wed May 16, 2018 2:48 pm

Thanks for your answer. But I know how to draw the first teeth in a sketch with "Part design". I don't know how to draw it with Draft toolbox. Is is possible to add constraints ?
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ppemawm
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby ppemawm » Wed May 16, 2018 2:52 pm

ljoets wrote:
Wed May 16, 2018 1:57 pm
Is there a tip to draw it with FreeCAD ?
I would sketch the space between the teeth and cut it from the pulley. Then you can use PartDesign/PolarPattern. See the example below:

Capture.JPG
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OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
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Build type: Release
Branch: releases/FreeCAD-0-16
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ljoets
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby ljoets » Wed May 16, 2018 3:08 pm

Thanks,
that is a good idea, but I just need a top view in SVG format tu use it with a laser cutter or a CNC.
Perhaps FreeCAD is not the right tool to do this ?
DeepSOIC
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby DeepSOIC » Wed May 16, 2018 3:20 pm

ljoets wrote:
Wed May 16, 2018 3:08 pm
I just need a top view in SVG format tu use it with a laser cutter or a CNC.
Perhaps FreeCAD is not the right tool to do this ?
FreeCAD IS the right tool for the job!

You can extract the outline for an svg with quite a few methods, such as Draft Downgrade, or maybe Draft Shape2DView, or Part Common with a face.
ljoets wrote:
Wed May 16, 2018 2:48 pm
But I know how to draw the first teeth in a sketch with "Part design". I don't know how to draw it with Draft toolbox
It is not a problem, you can mix tools from different workbenches. Sure, there are limitations, but many workbenches can be combined to achieve the result.

My tutorial for Lattice2 add-on workbench might be helpful:
https://github.com/DeepSOIC/Lattice2/wi ... t-Tutorial
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ppemawm
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby ppemawm » Wed May 16, 2018 3:22 pm

ljoets wrote:
Wed May 16, 2018 3:08 pm
I just need a top view in SVG format
Use the Drawing workbench to create the view then you can export as SVG file:
Attachments
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ljoets
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby ljoets » Wed May 16, 2018 3:37 pm

Thanks to all !
I did the job !
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oldmachine
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby oldmachine » Wed May 16, 2018 4:24 pm

Just curious... Your opening comment & link suggests you want a HTD-M tooth. That is different than the one in the follow-up comments (radius'd bottom Versus rectangular...).

According to the dim's in the link, this is what the tooth looks like...
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Screen Shot 2018-05-16 at 8.32.33 AM.png
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3D Parts & Links (made using FreeCad and Solidworks): https://www.thingiverse.com/Still_Breathing/designs
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ljoets
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Re: Drawing 100 tooth HTD 3M timing pulley

Postby ljoets » Wed May 16, 2018 7:01 pm

Is someone can tell me why 2 tooth are not cutted ?
Capture d'écran de 2018-05-16 20-56-48.png
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Capture d'écran de 2018-05-16 20-56-38.png
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Poulie HTD-3M 100T.fcstd
(229.94 KiB) Downloaded 5 times
Thanks ;-)