For those that were not part of the Kickstarter: Where to obtain the main motor/worm gear/encoder

Hey, so this is my first time posting here, but I’ve found this thread informative. Recently I’ve been trying to figure out if building a DIY Maslow is an option. I found a link that I’m curious about on Alibaba with a min order of 2. I’m very new to following this project, so I was hoping to get some insight into if these motors would work.

https://www.alibaba.com/product-detail/et-wgm58a-e-12v-worm-gear_60662670578.html

that “Min order of 2” will end up telling you to contact Bar and Hannah to order
from them. That manufacturer doesn’t have anyone in the US who sells those
motors in small quantities.

There are a number of people who have been looking for other motors to use, but
nobody has finished a machine and reported success.

Yeah, that’s what I was afraid of. I’ll be keeping an eye out for anyone who does, hopefully that gets resolved soon. Thanks.

This one looks super close ( the 30RPM model ) but I can’t find the stall current. To see if they would work with the stock motor board. I’ve messaged the seller to see if they can provide data sheet. I’ll let you know when they reply. Wish I had found these first ( If they are a match ) would have saved me around $70

I can also point you to the motors I purchased, but they require a different driver board and some manual engineering/soldering/making custom jumpers/cables. Basicly you’d have to work for it, and it costs a little more. When I say a little more I mean if you were buying in volume all the parts would be cheaper. The total price is really close to the Kit, but I digrees. If you want let me know and I’ll hook you up with my parts list with urls and prices.

Hey, thanks for thinking of me …so are you up and running? I have such little time to mess with this and literally looked everywhere. I started to question the chances of actually even getting the motor I order from some sellers because I started to see errors on the specs. That aside, I ordered two that sort of fit just two days ago. Don’t have lin l with me right now but will post tomorrow when I get a chance. I figured I was fine with slower rpm but could not have too high a ratio (concerned about speed ability of the arduino to process the encoder). But, I just wanted to experiment as I caught the sled discussion the other day and it was exactly the road I was going down. I had researched vertical plotters and realized that having the chains aim to the bit was best for accuracy with those. So, I am waiting for the motors. I don’t care if it winds up being smaller …can build bigger later. Oh, already been down the road with that link you posted I think. If I remember correctly they were tiny. Lol.

Will post the link when I can tomorrow with my rational.

I have two of these motors from this vender http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItemVersion&item=232236292051&view=all&tid=1450117362013 appears to be the same thing.
Mine has all metal gears in it and appears to be well made! I’m still waiting for the shield to come from Maslow and the sprockets to come from China. I will be building a lighter sled and using a Bosch Colt router that I have modified for a er11 collet. I have some experience with CNC machines, I built conventional CNC routers and I converted my metal lathe/ milling machine combo to CNC control but I have never worked with servo motors and encoders before!

My motors have 6mm shafts, What is the shaft size on the “official” gearboxes?

No I’m waiting on parts :pensive:

8mm which is .3149 in.

I’m going to go ahead and build a machine with these motors. I think they will work but likely won’t last as long as the ones supplied by Maslow. I’m hoping they last long enough that I can then purchase some from Bar. They certainly aren’t very expensive!

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Taking it in stages is a cost effective course. I could have saved about $90 had I found smaller motors first. Plus you can always use the Maslow to make things to sell and pay for Maslow upgrades.

By the way, I don’t recommend the Colt router for CNC work! The lower bearing in it is in a plastic retainer which melts when you try to run the router for hours as on a CNC. Likely never a problem when they are used normally. I have modified mine to eliminate the plastic piece and installed heavier bearings. The modification is great but it required delicate machining so isn’t something the average homeowner could do. While I was in there I installed an accurate ER11 collet so I can use whatever size bites I want but that was another delicate machining job!

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I intend to build one of these for my plasma torch, seems like it would be a natural for that and the sled would be very light with no cutting pressure. Having the sled “float” on the work-piece should help with the warping that happens with conventional CNC machines, causing the arc to stop if the distance gets too great and causing collisions with the work-piece if it warps upward. We shall see!

Please consider adding your observations regarding the Colt router to a new page linked to the Tested Routers List wiki page by following the conventions found there.

thanks!

I ordered these from amazon thinking I had the correct gear box but was going to switch out the motor for one with an encoder. Should have checked the measurements as what I got was a very small motor and gearbox. Can anyone post the dimensions of the gear box/motor that comes with the kit? It appears that item 232236292051 is probably the same small gear box and motor with integrated encoder.

that gearbox has the screw holes at 18x33mm, the maslow motor has them at
~27x40mm

the motor is a lot bigger (the one you link to is 25mm diax31mm long) at ~37mm
dia and 58mm long (75mm including the encoder)

That is the concern with this ebay motor with encoder as no sizes are given. http://www.ebay.com/itm/232236292051?var=531453441964 I think it is the smaller gear box/motor with an encoder added.

I bought two of these http://www.ebay.com/itm/Hightorque-Turbo-worm-Geared-motorGW370-DC12V6RPM-motor-with-encoder/142034119941?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 I went with these because they have a force of 30kg-cm working and a stall force of 150kg-cm. the item discription has all the spec and mounting sizes with a 972 gear ratio and 11ppr for 10692 steps. it is a 1/4 of the speed but shoud get the job done.

I will repost when it is fully working waiting on a few part and some free time.

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I want to thank everyone for going out on a limb and experimenting with these motors! I look forward to seeing what happens. I just bought a rigid R22002, so I guess I’m invested now. I’m really hoping to get cutting soon.

Not to rain on your parade (and might still work) but if ratio is 972 your total is =972 x 11 x 4 (quadrature) = 42,768 ppr. I do not know if the arduino can handle those pulses. That is why it is so tricky trying to aim for the stock motor at ~8000 pot.
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