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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
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 pulleysQuote:
Originally Posted by wallyblackburn
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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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?Quote:
Originally Posted by wallyblackburn
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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Well, here is what I ended up with:
Attachment 23895
Attachment 23894
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!Quote:
Originally Posted by wallyblackburn
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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More importantly is that a Mustang in the rear of the photo? Camaro and Firebird man myself but could slum it with a mustang whilst I wait for a 67SS to drop from the sky or a 77 Trans Am ;)
The commercial printers we scrap always have tensioners on and the belt lengths are measured in inches (Short), if you can get tensioners easily enough than I'd fit them. They're sprung to apply constant tension and are adjustable.
It is actually a '65 T-Bird. I went to an auction with the intention of buying a '63 Impala SS, and somehow came home with that over-engineered POS. Auction fever, I guess!Quote:
Originally Posted by Desertboy
I think I will try to fab up a tensioner for the top span.
Regards,
Wallace