Shapeoko 3 belt tensioning technique(s)
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Shapeoko 3 belt tensioning technique(s)
Okay, got mine pretty much together and after a successful jogging last night will be back to tensioning the belts.
Initially, I'd misliked the idea of slots and ovals for the motor mounting, but on the way in to work this morning had the idea of taking advantage of them and the weight of the machine to get consistent belt tension:
- position the motors at their lowest point
- connect the belts, trying to make them reasonably and consistently tight --- ensure that they're centered in the too wide (and ready for upgrading to wider belts!) slots
in turn:
- slide the carriage to the opposite side and center the gantry
- loosen the motor on the side opposite the carriage
- lift the machine up by the motor
- tighten the motor
- repeat that for each motor --- belt tension will be equal (same half weight of the machine) for the Y-axis
Does that seem like a reasonable technique? is ~half the weight of the machine a reasonable amount of tension? Anyone have suggestions on the Z-axis?
Anyway, if Edward already came up w/ this idea, great minds think alike and all that.
Initially, I'd misliked the idea of slots and ovals for the motor mounting, but on the way in to work this morning had the idea of taking advantage of them and the weight of the machine to get consistent belt tension:
- position the motors at their lowest point
- connect the belts, trying to make them reasonably and consistently tight --- ensure that they're centered in the too wide (and ready for upgrading to wider belts!) slots
in turn:
- slide the carriage to the opposite side and center the gantry
- loosen the motor on the side opposite the carriage
- lift the machine up by the motor
- tighten the motor
- repeat that for each motor --- belt tension will be equal (same half weight of the machine) for the Y-axis
Does that seem like a reasonable technique? is ~half the weight of the machine a reasonable amount of tension? Anyone have suggestions on the Z-axis?
Anyway, if Edward already came up w/ this idea, great minds think alike and all that.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets
Re: Shapeoko 3 belt tensioning technique(s)
It's a very innovative way to get consistent tension out of the box, but what happens when you upgrade? Tension will still be even between belts, but it could become twice as much with a size increase. Did you try the frequency method talked about in this thread? http://www.shapeoko.com/forum/viewtopic.php?f=7&t=5827
I'll be giving the app a try myself this weekend.
I'll be giving the app a try myself this weekend.
Shapeoko #1,123
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Re: Shapeoko 3 belt tensioning technique(s)
Yeah, the app is neat, and better than my previous idea of using a guitar tuner.
Upgraded machines will definitely need something different, but I was hoping this would be useful for the base case scenario of a stock machine.
Upgraded machines will definitely need something different, but I was hoping this would be useful for the base case scenario of a stock machine.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets
Re: Shapeoko 3 belt tensioning technique(s)
I do think your idea is about as good as it gets for stock tensioning. Total tension should be 10-12 pounds from this method, based on half of a ~55 lb machine over two sides of the belt minus a little friction. Based on my research (not experience, because I dunno how tight my MXLs are), that's right in the butter zone for the stock belts.
Shapeoko #1,123
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Re: Shapeoko 3 belt tensioning technique(s)
Thanks!
I just finished tensioning the belts on my machine and they seem good and consistently taut.
Finishing up some odds and ends, then have to make up an adapter and see about repurposing the dust shoe I have and I should be good to cut.
I just finished tensioning the belts on my machine and they seem good and consistently taut.
Finishing up some odds and ends, then have to make up an adapter and see about repurposing the dust shoe I have and I should be good to cut.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets
Re: Shapeoko 3 belt tensioning technique(s)
Update on the app: didn't work for me. My belts aren't loud enough for the app to read them. I think I could get a louder tone if I could get the tension higher, but the original raised belt configuration doesn't allow much tension and is difficult to adjust.
Shapeoko #1,123
Re: Shapeoko 3 belt tensioning technique(s)
I actually did not use this method to tension my belts. I found I got a pretty good amount of tension just by leaving the bolts for the belt anchor loose, pulling the belt tight, and then tightening the belt anchors.
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Re: Shapeoko 3 belt tensioning technique(s)
Tim - your method exactly the method to use. I'll mention that in the instructions during the next revision.
The intended routing is as follows:
1.) Over top of clamp to rear slot
2.) Down through rear slot
3.) Back towards front of clamp
4.) Up through front slot
5.) The belt should now be pointing in the reverse direction as it started.
I'll try to add an image to help clarify.
The intended routing is as follows:
1.) Over top of clamp to rear slot
2.) Down through rear slot
3.) Back towards front of clamp
4.) Up through front slot
5.) The belt should now be pointing in the reverse direction as it started.
I'll try to add an image to help clarify.
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock
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Re: Shapeoko 3 belt tensioning technique(s)
I did that first, but then I couldn't get the tension even betwixt the two Y-belts.twforeman wrote:I actually did not use this method to tension my belts. I found I got a pretty good amount of tension just by leaving the bolts for the belt anchor loose, pulling the belt tight, and then tightening the belt anchors.
Hey! What happened to #s 0 and 1?edwardrford wrote:Shapeoko 3 #2 - Stock
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets
Re: Shapeoko 3 belt tensioning technique(s)
Here a link to the belt routing in case anyone needs it. Edward was kind enough to share this with me when we were working through an issue.
This is from a SO2, but should be a good visual.
http://docs.shapeoko.com/content/belt-r ... ng-066.jpg
This is from a SO2, but should be a good visual.
http://docs.shapeoko.com/content/belt-r ... ng-066.jpg