where to buy servos

[dgalaxy]

Im looking for good suppliers to buy nema 42 servos i really would like to stay away from ebay looking for some decent prices maybe around the 600 and under range for a 26inch nema 42 any responses would be greatly appreciated

[NC Cams]

Reliance, Kollenmorgan (??), Baldor, Pac Sci.

Finding any servo cheap off E-slay is going to be tough.

[ezland00]

http://www.camtronics-cnc.com/

[dgalaxy]

i just emailed him hopefully he can get some nema42 servos right now he doesnt have any.

[NC Cams]

AjaxCNC has servos but I dunno if they are 42's.

[unterhaus]

For $600, you are going to be outbidding everyone on ebay, and buying junk elsewhere. But it's your choice.

I think that those Ajax servos are nema 42 because they are for bridgeports, but it looks like one nema 42 is $600

[dgalaxy]

those are the ones i was thinking about getting. so you guys think i should defintily be looking alsewhere than ajax hopefully camtronics cnc will come through for me this week i thiking about useng rutex drives for my servos
really not sure if the if i want to run 80v on this size with geckos

[NC Cams]

You are in a classic situation:

You are looking for a big servo.

Big servo's are NOT inexpensive.

Big servo's are NOT necessarily available as surplus.

Lower volumes are directly proportional to higher prices.

E-slay stuff can be a sourrce of inexpensive but not necessarily cheap stuff.

If you can find a good quality, new, surplus, NEMA 42 at a reasonable price from a trustworthy seller, you'd better buy it and not dink around. Otherwise, the opportunity could pass you buy.

Life is full of opportunities, some missed and some taken advantage of and some that go by un-noticed.

As far as the specs go, to make the power and speed you need, that takes power. Power is a dot product of amps and volts. At the same power level (say 1 hp or 745 watts) , a 140 volt motor will pull about 43% less current than an 80 volt motor.

Hence, if you need a starter motor to move what you intend to move, you'd better plan on using a drive with some real OOMPH. Be sure to have a drive with surplus current as that gets higher as voltage goes lower.

As I recall, Rutex has some real stiff newer style amps that can drive motors that pull high current at voltages approaching 200. This is purely due to the switching mosfets, which will cost more - the control circuits are effectively the same as the lower power offerings.

When it comes to making rapid speed changes and/or high surges, the stiffer amps are a worthwhile investment.


Edit: BTW, a google of "NEMA 42 Servo" turned up the following, bottom of page:

http://www.simpleservo.com/cgi-bin/pricing.pl?523motor

This would suggest that a $600 price for a NEMA 42 with an armature voltage of only 80 volts would be a real find.

However, if you look a bit more thru google, you find the following source for custom made motors:

http://www.satconorders.biz/shopping...product=Motors

The key to finding a fleck of gold in a stream is to look long and hard. With a proper and broader, actually, an even rudimentagy use of the internet, you don't have to look THAT long or THAT hard anymore to find flecks anymore (only 3 page deep search).....

[unterhaus]

I didn't mean to imply that Ajax was junk, but it will be low end in comparison to the best you are going to find on Ebay. I took $600 to mean $200 per motor, if you mean per motor, things are a little different, although it makes Ebay an even better place to purchase -- you should be able to get motors/drives/cables for that price.

I think Baldor may sell servos in that price range. I'm sure there are tons of Chinese manufacturers that do, but I have no idea about them. I'd trust Dan Mauch if he can get you motors.

My limit for motors is $50, and $100 if they have cables. I've gotten some really nice motors on Ebay, but I haven't been buying recently. Summer is the time to shop for industrial stuff on Ebay, it goes cheap. On the downside, there is no doubt about it, I've fried some brain cells studying manuals trying to figure out if I should bid on motors/drives on Ebay.

[NC Cams]

In reviewing the post, the following comment sticks out,

"...so you guys think i should defintily be looking alsewhere..."

Not hardly. The original question/stipulation was,

"...I'm looking for good suppliers to buy nema 42 servos I really would like to stay away from ebay..."

This stipulation pretty much forced one to suggest the typical "retail" sources as opposed to surplus suppliers of clearly specialized and large and not necessarily cheap servos.

Price shopping is always a priority when it comes to doing DIY CNC. The key word is "shopping" from the usual suspects/methods and ultimately compromising as the situation warrants.

You ultimately either have to compromise on sourcing (go e-bay) or cost (pay more), especially when it comes to motors that are industrial sized that will not be "aspirin priced".

[dgalaxy]

Thank you so much for your replies ,ill give you guys an update on what i did
im also looking at servo dynamics as a source
ya nc cams im definitly going with rutex for sure Tom Eldridge is very helpful