1st Build, Steel, Epoxy 24"x24" for Wood

[Nr1madman]

Hmm keling is us based I think.. they have good motors! :)

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[wallyblackburn]

Given the "hackfest" nature of this build, I went ahead and ordered this for the twin-screw axis:

https://www.ebay.com/itm/US-Ship-1ax...72.m2749.l2649

Says 1090 in-oz. (I get 7.7 Nm) and 4.1mH inductance. My intention is to mount it underneath and between the 2 ballscrews and come up with a timing belt arrangement to drive both from one motor. If I can get the Y-axis moving under power, it will give me encouragement to drive forward.

Thanks,
Wallace

[wallyblackburn]

Not as easy as I thought to find timing belt pulleys and belts. What width belt would I need to drive this? I see XL, L, HTD, etc. - what do you guys typically use?

Thanks,
Wallace

[Clive S]

Not as easy as I thought to find timing belt pulleys and belts. What width belt would I need to drive this? I see XL, L, HTD, etc. - what do you guys typically use?

Thanks,
Wallace

I use HTD belt and pulleys

[Nr1madman]

Htd is supposed to have much lower backlash then the other profiles (backlash free?)
Go with 5mm pitch.. seems a popular choice. I got 3mm pitch delivered and Im hoping thats fine.
15mm width belt is a good choice.
Saw a spreadsheet that demonstrated that 10mm width is fine for routers but it seemed close so I chose 15mm :)

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[wallyblackburn]

Thanks guys. Well, I find a ton of them on eBay - of course they are all from China and seller is away until 02/20. Oh well, I guess our friends in Asia need time off too :)

I am just looking for 1:1 I think. I just want to drive both screws from one motor. Given that I was going to pick 3 20 tooth pulleys and 2 idlers. Any reason to use more or less teeth?

Thanks,
Wallace

[Nr1madman]

Thanks guys. Well, I find a ton of them on eBay - of course they are all from China and seller is away until 02/20. Oh well, I guess our friends in Asia need time off too :)

I am just looking for 1:1 I think. I just want to drive both screws from one motor. Given that I was going to pick 3 20 tooth pulleys and 2 idlers. Any reason to use more or less teeth?

Thanks,
Wallace

How about belting online? I think they are uk based?

20tooth pulleys are generally recommended here.
Good size to strength to tooth engagement.
Larger pulleys have higher inertia
Smaller pulleys have smaller boss for setscrews

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[wallyblackburn]

Well, here is what I ended up with:





Sorry the 2nd pic is rotated (again) - but I think I figured it out now that I have one that is and one that isn't...

Anyway, I am thinking of an adjustable tensioner. Seems like a long span there on top - you guys think that'll be a problem? I really have no experience with timing belts like this.

Thanks,
Wallace

[Nr1madman]

Well, here is what I ended up with:





Sorry the 2nd pic is rotated (again) - but I think I figured it out now that I have one that is and one that isn't...

Anyway, I am thinking of an adjustable tensioner. Seems like a long span there on top - you guys think that'll be a problem? I really have no experience with timing belts like this.

Thanks,
Wallace

Hey Wally!

I have no experience with such long belts, but I can imagine that the top part will flap if going fast?
A tensioner on top might be a good stabilizer ;)



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[Nr1madman]

Nicely done :D

How fast are you going in that YouTube vid?

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