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opulo-inc / lumenpnp

The LumenPnP is an open source pick and place machine.
GNU General Public License v3.0
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[CAD] - Tensioning system for X/Y/Z Belts #229

Closed cad435 closed 3 years ago

cad435 commented 3 years ago

In Order to get better precision, a belt tensioning system should be added. For the Y-Axis this should be added onto the front Index leg (opposite side of stepper motor)

however, as some people already printed the complete index frame (me included) I modeled a quick addon. This tensioner can be used instead of any existing belt clamp. (Intended for use on Y-Axis, NOT X-Axis!) unknown

the left arrows point to two slots where two M3 nuts are inserted. Between the right blocks is a M3 screw. which has some 7x3x3 bearings onto it. A stack of M3 spacers also can be used instead of bearings.

.step an STL's attached, use it at your own risk! Tensioner_Fix.zip

Edit: tension the belt, then move the axis and only after moving check the tensioning strength of the belt!

Edit: please use the latest version provided in my latest post for this issue

daveismith commented 3 years ago

@cad435, what range of motion (in mm) does the tensioner need?

cad435 commented 3 years ago

About 2-3mm will do... More will be better, but I don't think necessary

darigovresearch commented 3 years ago

Think this would be a great feature to add, over time belts lose their tension and having a way to do it in index would greatly reduce frustration after prolonged use!

mhorsche commented 3 years ago

Adjusted the "FDM-0013-00_x-idler-mount" and added a carrier. Works perfect for me but use at own risk. FDM-0013-XX_x-idler-mount.zip

x-idler-tensioner001 x-idler-tensioner002

darigovresearch commented 3 years ago

Thanks @mhorsche thanks for taking a look at this, we haven't built an index yet so can't test it but as an initial release may be worth putting in a pull request depending on what the maintainers think. Do you have any photos of the part in use?

What do the maintainers/hardware builders think?

daveismith commented 3 years ago

Stephen is also doing some tensioning work so hopefully between the two we get something that works well.

On Sat, May 8, 2021 at 08:31 Darigov Research @.***> wrote:

Thanks @mhorsche https://github.com/mhorsche thanks for taking a look at this, we haven't built an index yet so can't test it but as an initial release may be worth putting in a pull request depending on what the maintainers think. Do you have any photos of the part in use?

What do the maintainers/hardware builders think?

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/index-machines/index/issues/229#issuecomment-835340493, or unsubscribe https://github.com/notifications/unsubscribe-auth/AANHPQ7R55SYXGK4ZCIWQK3TMUVJVANCNFSM4ZWA3RMQ .

darigovresearch commented 3 years ago

@daveismith thanks for the heads up, looking forward to seeing it!

MisterHW commented 3 years ago

Exciting work! I'll leave my tensioning approach here for entertainment and inspiration. It certainly uses a minimal amount of fasteners, but it's only practical with custom sheet metal work in a certain volume.

image

https://hackaday.io/page/7198-hose-clamp-style-gt2-belt-tensioners

(timing belt crimp clamps are available, so please ignore the heat shrink tube)

maghostmil commented 3 years ago

.step an STL's attached, use it at your own risk! Tensioner_Fix.zip

Can you add this .zip file again? It looks like expired - 404 Not found.

cad435 commented 3 years ago

@maghostmil

Tensioner.zip

I'll close this issue now, as this is resolved by @sphawes in https://www.youtube.com/watch?v=EN0TxylB010&

maghostmil commented 3 years ago

@maghostmil

Tensioner.zip

I'll close this issue now, as this is resolved by @sphawes in https://www.youtube.com/watch?v=EN0TxylB010&

Yes, but I completed assembly of earlier version and I need only this quick addon. Thanks.

cad435 commented 3 years ago

@maghostmil errm, I did a better job with this new tensioner addon...

IMG_20210525_155022

Y_Tensioner v5.zip

sorry this came a day late... its better in nearly any aspect...

maghostmil commented 3 years ago

Thanks @cad435. In the end, the solution from first post didn't work so well for me. When the bolt was tightened more, the addon broke at the nut. Today I will test your new version of this addon.

maghostmil commented 3 years ago

@cad435 , I've tested this v5 addon, and works better than previous version, but I have one question for you: Wouldn't a 5mm hole be better (like hole in idler)? I feel micro-vibrations caused by idler isn't properly in whole hole.

cad435 commented 3 years ago

Well, I had only 3mm bore Idlers on hand, so I made it a M3 Bolt without any hesitation...

I may just forgotten, that the Index uses 5mm bore Idlers tbh.

But you can modify it (it's a .step, so any CAD will work) or drill out the hole... I might do it tomorrow if I don't forget it till then :)