60$ rotary table?

[vacpress]

http://cgi.ebay.com/ws/eBayISAPI.dll...category=11809


wadda you guys think?

[jimbo]

dont buy it there. saw the same thing at surplus center. http://surpluscenter.com/item.asp?UI...tname=electric

I bought one off ebay for 30 before I saw the one at surplus center. the table itself is pretty nice though.

[vacpress]

jimbo - do they work for rotary machining? how heavy duty is it?

could it be joints for a smallish robot arm? is it worth the $20 ?

backlash? speed? 4.5rpm?

could a bigger servo or a stepper be changed in?

how heavyduty does it seem?

[jimbo]

I dont have access to it now, maybe in a week I could get some pics of it taken apart. I would say it is definitely worth the 20 maybe more. It is a nice piece of machining, all aluminum body and steel gears. I would like to know its original application, it is much more than a turntable.

I have not actually used it yet because my router is not done. But I did power it up on 12v, it was smooth, quiet and unstoppable. I could not feel any discernible backlash but I am sure there is some present with the gears. It is too slow as is. The motor/gearbox can be unbolted but I believe the pinion is pressed on the gearbox and the gearbox shaft was some odd size like 3/16".

At some point I would like to put adapt a servo to it and flush mount this permanently into the table of a moving gantry router.

They would probably be perfect for robot joints although I dont know how small is possible, or perhaps as the base of the arm. I hadnt thought of that. Maybe I should pick some extras. Only 2700 in stock.

It seems quite heavy duty and rigid, from memory it had a big sealed bearing like 4" ODx3"IDx.75" D that the table rotates on.

let me know if you would like the pics later.

[jimbo]

also, only the center part rotates, it is like 3-4" dia, but with another plate bolted on it can be any size.

also surplus center says it has an encoder, it is not an encoder by normal terms. I believe it is just a tachometer or a 1ppr encoder. It does have a brake that can be tied to the motor supply to disable.

[Bloy2004]

I believe that those devices were for turning those bigger dish antenna that used to be seen often in back yards... I was one of the guys that got one for the higher price...then as the order was shipped, discovered the better deal at Surplus....oh well.

[boxwood]

Yeah this guy used 2 of those hooked together to make a 5 axis router... very impressive
http://www.rainnea.com/cnc.htm

[vacpress]

boxwood - that rainnea machine uses these things?

i think im sold... i also like the idea that its got brakes... perfect for robot arms... assuming i can get those cliftons to interface the things...


i mean.. a $30. high powered servo driven rotary joint with a brake built in... just gotta get a real encoder on the thing.... i mean.. its practically a breakthrough... for me.. anyhow...


plus, that rainnea machine is very very amazing

[jimbo]

the brake is on back of the globe motor so if you change to another servo you lose the brake.

I would also like to know if the rainnea machine really uses these units. They dont quite look the same.

[teilhardo]

I just bough one. I agree, for $30 it is well worth it. Even if one can't use it as a rotary table, the DC motor, gears and aluminum...all useful "junk" to have around the "shop"
-Tei

[vacpress]

yeah - i just looked at the rainnea machine again. those look like asian import 4" rotary machining table. those are like $100 without a motor or anything.

[georgebarr]

Does this item found at surpluscenter.com include the big rotary table and the motor? I can use this as a 4th axis for the lathe part of my mill.

Originally posted by jimbo dont buy it there. saw the same thing at surplus center. http://surpluscenter.com/item.asp?UI...tname=electric I bought one off ebay for 30 before I saw the one at surplus center. the table itself is pretty nice though.