I am looking for information on sizing rack and pinion and timing gears. I am reserching for a cnc plasma table and this is the one area I have no experience with. Does anyone know where I can get the information for this. I would like to learn to do sizing as I figure that I may need to do it again sometime and would need to know how to do it. I find that if someone just tells you the what to use for gearing, then you really don't learn anything. I have a good idea what i need, but want to learn to do it right.

Gary

It is reasonable in detail here.
http://www.cnczone.com/forums/showthread.php?t=23872

I am looking for information on sizing rack and pinion and timing gears. I am reserching for a cnc plasma table and this is the one area I have no experience with. Does anyone know where I can get the information for this. I would like to learn to do sizing as I figure that I may need to do it again sometime and would need to know how to do it. I find that if someone just tells you the what to use for gearing, then you really don't learn anything. I have a good idea what i need, but want to learn to do it right.

Gary

Try this link. I worked for these guys. http://www.sdp-si.com/ Sterling Instrument is in New Hyde Park NY.

I assume you mean the optimum ratio for a given machine and conditions, check out one of the sizing programs like Kolmorgen etc, most servo manufacturers have graphic programs that just require machine mechanics to be plugged in.
There are a lot of previous posts on the subject like this.
http://cnczone.com/forums/showthread.php?t=22110&highlight=inertia+ratio
Specifically motor to load inertia ratio.
Al.

Alpha Gear has a great program called Cymex, free download but you have to register.

Thanks for the help. it has all been very helpful.

Gary