A (New?) GT2 Timing Belt and Pulley source

Hi guys, I'm new to Reprap and just starting off my first build. I work with systems that use stepper motors, 2mm pitch timing belts, and pulleys at my day job, so when I saw that for Prusa Mendel V2 people were recommending a more accurate than T5 timing belt I knew immediately that that was the right thing to do. I know from experience the kinds of gains in accuracy and precision you get from belt tightness and teeth size.

Anyways, I saw that in the belt guides (such as [reprap.org]) the only suppliers really were sdp-si and Misumi. Unfortunately the former only has something like 36 teeth pulleys, and the latter doesn't have a very friendly website at all. I wanted to maximize torque, since stepper motor speed didn't seem to be a limiting factor - just backlash, etc. So I did a little searching and found this place: royalsupply.com

I just purchased my timing belts and pulleys. I got them 6mm wide, and chose the 18 teeth pulley (as per the minimum in the guide, and as a general average in what I've read other people were getting). Here are their pages for GT2 belts and pulleys:

Pulley: [www.royalsupply.com]

Belt: [www.royalsupply.com]

Just figured some people might find this useful. Their pulley selection is great, but if you want belts the closest to 1m in size they have is something like 1.164 meters (the one I linked) which should work fine.

Edited 1 time(s). Last edit at 04/09/2012 01:40AM by pwn4.

Thanks that's pretty helpful actually. I'm about to extend the print size of my Prusa and I was thinking of upgrading the belt system while I'm at it.

Thanks for the links. Any updates on your order? Did the pulleys and belts end up working out ok for you? I'm interested in getting the same ones, but am concerned about whether or not the pulleys would fit on the motor shafts.

Regarding the Misumi website, IMO it's like Google in terms of usability compared to that Royal Supply website. I can't find anything on there...

But if you tell me that you've actually received and used the parts that you linked to, I may try to place an order.

Shipping isn't too bad - I ordered 5 belts 2 sprockets on april 9th, it was shipped on April 13th, and I guess 'cause I live in Canada and didn't pay for faster shipping it's been in transit.

They gave me a UPS tracking number, though, which is nice. It went from ohio, to indiana, to illinois, to washington, and has arrived here in Richmond, BC yesterday. The last entry on the log says "Departure Scan" at 1:10 AM today, so presumably it will arrive here Monday since they don't deliver regular priority packages in Saturday. I'll let you guys know how they seem when I get them

im new to reprap also just starting my first build. i found this site [www.bbman.com] quick shipping and good prices.

i need a belt longer than1 meter they list them but no stock on any over a meter but good selection smaller.

also i think its a $30 min order

The order finally came in. It took them a few days to get it on its way. Unfortunately the pulleys seem to be a little small for the motor shaft. I'm not sure what I'm going to do about that yet. Other than that I think these will work quite nicely. The way these fit together seem quite a bit more precise than the original t5 timing belt. Hopefully I get some good result with these.

Got mine as well. Quality seems good, but the pulleys also did not fit on the motor shaft. I precariously put both gears in a wooden vice and drilled out the inside with my hand drill (slowly, carefully) without too much issue. They fit on now fine, but the motor shafts are metric and I used a standard drill bit so the fit isn't perfect. I think they'll be fine though.

I'm a little baffled by you guys saying that the shaft size was wrong. Of course it was! The webpage for that pulley clearly says that the bore is 3/16th inches (4.7625 millimeters). Stepper shaft is 5mm.

Perhaps you should have looked a little further down the page? Drilling out these pulleys by hand is a recipe for an off-center pulley which leads to uneven prints.

You might want to replace them with the Ultimachine pulleys for cheaper : [ultimachine.com]

amramsey Wrote:
-------------------------------------------------------
> I'm a little baffled by you guys saying that the
> shaft size was wrong. Of course it was! The
> webpage for that pulley clearly says that the bore
> is 3/16th inches (4.7625 millimeters). Stepper
> shaft is 5mm.
>
> Perhaps you should have looked a little further
> down the page? Drilling out these pulleys by hand
> is a recipe for an off-center pulley which leads
> to uneven prints.
>
> You might want to replace them with the
> Ultimachine pulleys for cheaper :
> [ultimachine.com]
> 0-tooth

amramsey you're the levelheaded friend I never had. Thanks for the link.

i just got some from lulzbot and they work great.
also, techpalidin , who is pointedstick on here has some that look the same to me.
both are at good prices.
as far as quality, i think it took out some of the waves in my prints that
was created by the big teeth going around the little 624 bearings on my orca x axis.
so flat sides are more flat.
they defiantly didn't hurt my print quality.

glrra19 Wrote:
-------------------------------------------------------
> i just got some from lulzbot and they work great.
> also, techpalidin , who is pointedstick on here
> has some that look the same to me.
> both are at good prices.
> as far as quality, i think it took out some of the
> waves in my prints that
> was created by the big teeth going around the
> little 624 bearings on my orca x axis.
> so flat sides are more flat.
> they defiantly didn't hurt my print quality.


Yep, they are the same; we both get 'em from the same supplier. I like the ones that Lulzbot and I sell because their interior diameter is nearly identical to that of the 608 bearings we use for our idlers. As a result, the belt is straight, eliminating a source of positional inaccuracy (especially for the X-carriage).

China Source of GT2 Pulley and Belt, please RobotDigg.

hey you guys have awesome prices. if i needed 4 meters of gt2 belt, how much would that run?

....and when are you gonna fix your shopping basket?

[openlab.com.au] (Australia)

Charlie's 3D Technologies

www.charlies3dtechnologies.eu

---

www.facebook.com/Charlies3DTechnologies
www.charlies3dtechnologies.com/webshop
webshop@charlies3dt.com

I just ordered from robotdigg.com, 10 meters of gt2 belt for 20 bucks, and 30 624zz bearings for 10.50. shipping is a little steep at 25 bucks but if you include that in the price of the stuff its a bargain, and I wont have to wait since its fedex instead of the free chinese shipping on ebay. the guys are really helpful too, they are just setting up the site, so you should contact them via email to make orders, but the shopping cart is now working to an extent. man im going to build some wicked corexy machines with the bearings and belt should be fun, 470mm^3 build area with 550mm/s working speed, 10000mm/s/s acceleration. should be fun and productive.

China Soure of GT2 pulley and belt
www.robotdigg.com

they are really high quality, the shipping sucks but it is fast. basically 25 bucks minimum shipping.