I always use HTD 5mm pitch 15mm width and a good brand is Gates, medway etc. If you go to any good bearing supplier and tell them you want quality brand not the cheap veriety they should be able to help.
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Yes it's all about teeth in mesh.!! With small pulleys there are less teeth engaged between belt and pulley, less teeth engaged means less able to handle high loads and reduce the amount of torque that can be transmitted and if wrong will rip teeth off the belt.
Read these and it will explain lots. . http://www.roymech.co.uk/Useful_Tables/Drive/Timing_belts.html
http://www.ondrives.com/data/pdf/pul...belts-tech.pdf
Jazz did you hear anything from Chai?
With 6 plastic inserts they must have 6 rows of balls, as each insert is a ball return tube. Additionally they're not going to use 3, or any odd number, rows of balls as that would result in uneven wear and all sorts due to having more balls running in one track...
I wonder if they're preloaded. A twin start screw with offset tracks in the nut is one way to apply preload - that would make them worthwhile.
As a general rule of thumb don't go below a 15T pulley with 5M HTD belts, and if you need much above 3:1 use double reduction. Use one of the many on-line calculators to find the number of teeth in mesh on the smallest pulley. They will give a warning if it is below 5...
http://www.sdp-si.com/cd/default.htm
No not heard anything yet but I only sent email late last night so don't expect too.
It's a flop over type nut so Yes it's 6 rows but 2 x 3 circuits per start. Like this http://motionsystemdesign.com/images...-ballscrew.jpg
Well thats how believe they are setup but I'm not striping it down to findout.:lol:
Yes by the feel of it I do feel that it's slightly preloaded as well.??
Hi Jonathon,
Are these still available.
Dean
They've sold to Jazz, sorry.
And he has the nerve to bad mouth you ?
I'd have scrapped them first................