9mm wide GT2 pulleys on SDP/SI

discussion of design changes / improvements / suggestions
WillAdams
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9mm wide GT2 pulleys on SDP/SI

Post by WillAdams » Sun Mar 29, 2015 6:45 pm

I'm only finding 6mm bore:

https://sdp-si.com/eStore/Catalog/PartN ... M020DF0906

What happened to 6.35mm? I could've sworn I saw them on Friday...

Suggestions for other belts/sources?
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
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Damin69
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by Damin69 » Sun Mar 29, 2015 7:28 pm

WillAdams wrote:I'm only finding 6mm bore:

https://sdp-si.com/eStore/Catalog/PartN ... M020DF0906

What happened to 6.35mm? I could've sworn I saw them on Friday...

Suggestions for other belts/sources?
I have been looking to upgrade to 9mm belts also. I found that Inventables actually carries the 9mm 1/4" bore and Belt. https://www.inventables.com/technologie ... gt2-pulley
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WillAdams
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by WillAdams » Sun Mar 29, 2015 8:46 pm

Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

WillAdams
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by WillAdams » Sun Mar 29, 2015 9:59 pm

Turns out inch/metric isn't just a toggle, but also a filter:

http://www.sdp-si.com/eStore/Catalog/Pa ... -020DF0908
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

cvoinescu
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by cvoinescu » Sun Mar 29, 2015 11:32 pm

Yes, it's their top-level watershed. And if you're not sure where, say, MXL pulleys (an imperial pitch) with 5 mm bore (metric) belong, you have to look in both categories... (Turns out they're under metric, by the way.)
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orangezero
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by orangezero » Mon Apr 13, 2015 4:38 pm

Does anyone have any source for the following:

GT2, 8mm bore (nema23), 9mm belt width?

I would guess the tooth # would have to be a bit higher than 16 or 20, but I can't seem to find anything right now. I already sent off an email to robotdigg. I'd like to upgrade to 9mm belts. It may be more expensive than I thought.

While we are on the subject, is there a preferred place to purchase 9mm gt2 belt of good quality?

thanks,

Gadgetman!
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by Gadgetman! » Tue Apr 14, 2015 5:32 pm

8mm bore?

Aren't NEMA23 shafts normally 1/4" (6.35mm)
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by cvoinescu » Tue Apr 14, 2015 6:08 pm

Most NEMA 23 motors have 6.35 mm shafts. Some have 8 mm shafts. A lot of NEMA 23 motors have 8 mm ID bearings inside, and the shaft is 8 mm internally, turned down to 6.35 mm on the exposed section. In that case, a version with an 8 mm shaft is identical internally.

You can get 20-tooth aluminium GT2 pulleys with 8 mm bore. I have some, but they're for 6 mm wide belt. I can't get you any for 9 mm wide belt, because the MOQ is something like 200, and it would take me forever to sell the remaining 197 pulleys. :)
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orangezero
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by orangezero » Wed Apr 29, 2015 4:17 pm

Just a quick follow up, thanks for the replies and information. I thought I had already left a thank you, but it must have been too difficult to hit the send button.

I'm worn out from searching gt2 belts and pulleys. Yes, there is a place in HK that sells $5 9mm wide, 8mm bore pulleys with 20 teeth, and more options if you don't need 8mm as I do. And gt2 9mm wide belt is available from a few places. It does seem as if when you go any bigger you really really start to get expensive. I'm guessing a lot has to do with most people using the smaller stuff for 3d printing and thus there is a lot of competition. 15mm wide, 3mm pitch belt is about the cost of a 1/2in acme 5 start for the same length. I'm hoping to read a bit more on that. You can get delrin anti-backlash nuts for $15, and 3ft rods for $20. Collars for 1/2in are really cheap, and so are bearings to hold the rods. Couplers are cheap. Seems like potentially a better long-term solution for around the same price.

In short, the 9mm "upgrade" isn't that much, but other options enter the picture when you go bigger. I need to read up on acme "whipping" at what lengths, thickness, material of rod, etc.

I'd still be curious to know what people are getting, but I'm not excited about paying $40-60 for a 3mm pitch pulley that is wide enough for a 15mm belt, which is also 10x more than a 6mm belt. Are my google skills that horrible? I found a 3ft 15mm wide gt2 3mm pitch belt for around $20, but the pulleys are non-existent or really expensive.

Thanks again.

WillAdams
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Re: 9mm wide GT2 pulleys on SDP/SI

Post by WillAdams » Wed Apr 29, 2015 4:23 pm

The thing is, while the 9mm belting makes sense at the smaller--medium sizes, the 15mm doesn't really factor in until one has a _really_ big machine --- at that point, the cost differential should be correspondingly greater.

We really do need a thorough examination of the various linear motion options and their relative costs and tradeoffs.
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

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