Hi Martin, 35 teeth metric module 1 is a good choice. If the pinions are quite cheap, I suggest you get some 25 teeth pinions as well. Then you can choose according to the materials you cut, speeds you need and quality of cutting surface.
thanx.....the steppers will be the Nema 23 with Torque 1.7n.m 245 oz.In.
Half inch pitch teeth will definitely not work. Nema 23's are also dodgy (even with 3-4mm pitch rack).
I did lots of searching for rack in Australia and the only option for the correct rack I could find was TEA. Let me know a total length of rack required and a rough price on what you have been quoted. The rack seems to be comming down in price since I got it acording to some other messages I have received.
I've ordered mine from Linear Bearings here in Adelaide (They have offices in most capital cities). I've bought a bit off them before and they gave me a deal i couldn't say no to. $42/m plus $14.40 per pinion (25T) not inclusing GST, so add 10%. So i ordered 3x 2m lengths and 4 pinions which should be sufficient for me.
please help me understand why half inch wont work...these guys are the top the industry with this system and they use 16 mm pitch ..check it out so i called the guy in Australia...$450.00 for a HALF METRE LENGTH yes mate 450..weel i said my good bye an put the phone down really dispointed but never the less here are the specs for your knowledge...not that you need more you clever bugger!
Last edited by vanhaydn; Sat 21 March 2009 at 23:11..
Thats great news on the rack..there is a agent here in PERTH YEEHAAAA!
of to see the guys on monday!
Look at the diameter of the driving pinion when you use 1/2" pitch . . . . where will you find the torque, or space to turn that 3" diameter monster?
I was just quoted NOK 1200(about US$200) for the racks in 2 meter length, NOK100(about $15) for the pinions in a local store here in Norway. Anyone found a good source for the racks and pinions with reasonable shipping in Europe?
I found Chiaravalli online store but did not contact.
I think they try to rip me off since I'm in Norway, they want ~€115 for the same racks (+ shipping and taxes). I'll try the other one you suggested.
Cape Town is only the 3rd or 4th biggest industrial city in South Africa, yet I have a choice of 3 gear/rack stockists. None of them are listed in any directory as gear/rack suppliers, but they are all listed as sprocket/chain suppliers - maybe the same situation applies there? Grab the Yellow Pages and look for power transmission, conveyors, material handling component suppliers. If someone tells you they don't have what you are looking for, that is a golden opportunity to ask them to suggest someone else. That's why I like shopping by phone, rather than "mailorder", you get these references of who does what.
For module 1 metric, the smallest practical pinion is 24 tooth to fit on a 12mm shaft end.
4:1 belt reduction will work well.
Last edited by cb4; Sat 01 May 2010 at 02:47..
I have finished the mechanical built, the only thing missing are the racks and pinions. Apart from Grainger I have not found a local supplier (I am in Puebla, Mexico). I would like to know if somebody could give me an opinion on the following specs. I have everything standard (standard motor with gear box 1:7.2).
Can i use this gear?
Asif, I have retired from the MechMate project. I will mostly avoid direct questions. Sorry, but I cannot spend the time to check everybody's catalogues.
Piñones Módulo1 Z:24 24 dientes.
La misma empresa se encarga de mecanizar los piñones al tamaño deseado.
Si quieren ver fotos del producto, las añadiré a mi hilo, una vez las tenga en el taller.
Last edited by isladelobos; Fri 04 February 2011 at 14:53..
and another quote: 8 € x meter .... but I don't think they send the racks outside of italy.