matthew.v8
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Upgraded Y axis belt tensioner

Thu Feb 08, 2018 5:36 pm

Hi everyone. I have designed a belt tensioner for the Y axis that fits where the original pulley mount fits. I posted it on thingiverse a few minutes ago, all of the information and details are there for what is needed. Let me know what everyone thinks considering I don't have my printer yet and can't test it. Is it a tad overkill? Maybe but I was bored waiting for my printer to come. Here is the link: https://www.thingiverse.com/thing:2786671

After you’ve printed and potentially tested it, let me know how it works out.

Posted below are a couple screenshots:
Attachments
installed tensioner.JPG
installed tensioner.JPG (53.32 KiB) Viewed 2036 times
Y AXIS ADJUSTABLE BELT TENSIONER.JPG
Y AXIS ADJUSTABLE BELT TENSIONER.JPG (29.43 KiB) Viewed 2036 times

peter.h33
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Re: Upgraded Y axis belt tensioner

Thu Feb 08, 2018 8:33 pm

scaled it to 1011.11 yours would fit on a jumbo printer lol

matthew.v8
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Re: Upgraded Y axis belt tensioner

Thu Feb 08, 2018 9:03 pm

peter.h33 wrote:
Thu Feb 08, 2018 8:33 pm
scaled it to 1011.11 yours would fit on a jumbo printer lol

Hahaha is there a scaling issue? This is my first upload on thingiverse. I created the parts in inventor With a metric ipt. Then converted to the stl files.

Not sure if there’s another way to create the stl without losing the proper dimensions.

peter.h33
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Re: Upgraded Y axis belt tensioner

Thu Feb 08, 2018 10:00 pm

I loaded it in s3d and thought that looks large so scaled it the same as the original mk3 parts at first I said that's a long print 15 hours lol all parts print to 9 hours now

matthew.v8
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Re: Upgraded Y axis belt tensioner

Thu Feb 08, 2018 10:13 pm

peter.h33 wrote:
Thu Feb 08, 2018 10:00 pm
I loaded it in s3d and thought that looks large so scaled it the same as the original mk3 parts at first I said that's a long print 15 hours lol all parts print to 9 hours now
Not sure why that’s happening. Yeah you can definitely use hole spacing between the two mounting holes or similar to scale it. What layer height are you doing and what type of supports are you using? Using pla, abs or petg? Let me know how it comes out. I have it printed here and am having fun playing with it without the printer lol

peter.l22
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Re: Upgraded Y axis belt tensioner

Thu Feb 08, 2018 11:09 pm

matthew.v8 wrote:
Thu Feb 08, 2018 9:03 pm
Hahaha is there a scaling issue? This is my first upload on thingiverse. I created the parts in inventor With a metric ipt. Then converted to the stl files.

Not sure if there’s another way to create the stl without losing the proper dimensions.
STL files don't have any units built in to the file. But by convention, STL files are usually in mm for 3D printing. However, some CAD software uses other units by default. You may want to check the settings in your Inventor preferences.

matthew.v8
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Re: Upgraded Y axis belt tensioner

Fri Feb 09, 2018 1:27 am

peter.l22 wrote:
Thu Feb 08, 2018 11:09 pm
matthew.v8 wrote:
Thu Feb 08, 2018 9:03 pm
Hahaha is there a scaling issue? This is my first upload on thingiverse. I created the parts in inventor With a metric ipt. Then converted to the stl files.

Not sure if there’s another way to create the stl without losing the proper dimensions.
STL files don't have any units built in to the file. But by convention, STL files are usually in mm for 3D printing. However, some CAD software uses other units by default. You may want to check the settings in your Inventor preferences.
I’ll have to look at the export settings in inventor. If it’s an issue I can also upload step files? This way people can manipulate the model if they’re using a different pulley.

thomas.h19
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Re: Upgraded Y axis belt tensioner

Fri Feb 09, 2018 2:49 am

I have not checked the details/tolerances etc on this but wouldn't the pulley be attempting to move in a circular path through a straight slot?

matthew.v8
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Re: Upgraded Y axis belt tensioner

Fri Feb 09, 2018 3:22 am

thomas.h19 wrote:
Fri Feb 09, 2018 2:49 am
I have not checked the details/tolerances etc on this but wouldn't the pulley be attempting to move in a circular path through a straight slot?
I should have shown the mechanism in a little more detail. When I get home tomorrow, I will show the side detail to help explain.

The movable side arms also have a slot on either side (much smaller length of slot compared to the one on the mount). The two slots lay on top of each other at an angle therefore giving the proper degree of freedom to allow the pulley to move back and forth in the slot linearly. As soon as you download and inspect the movable arm pieces, you will see what I mean.

Once its all assembled it’s a neat little part to play with. One of the first useful things I’ve designed to have printed.

matthew.v8
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Re: Upgraded Y axis belt tensioner

Fri Feb 09, 2018 2:03 pm

So it turns out I uploaded the STL files incorrectly. I reuploaded them to thingiverse with the proper dimensions associated with them as well as a higher resolution. Those are now available for download. As for the question of how it works. Here is a screenshot of the side with the arm in both positions.
Attachments
17EB00F9-C26D-4FEB-9A50-BD89282F5915.png
17EB00F9-C26D-4FEB-9A50-BD89282F5915.png (60.4 KiB) Viewed 1680 times
9A96CC9F-4ECC-419D-AD4F-54D3F4270D27.png
9A96CC9F-4ECC-419D-AD4F-54D3F4270D27.png (79.04 KiB) Viewed 1680 times

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