DIY 400mm CNC mill

[richb77]

Ok, new question...

I am looking at getting my motors and dont know how to spec them.

i have been offered a couple of free mclennan M500 servo motors (without gearboxes) http://www.mclennan.co.uk/datasheets...reddcmotor.pdf

They need repair (positional optics parts) but are free

are they suitable?

what spec do i need for medium duty >400mm travel?

[Gary]

These motors are about 0.15 Nm, so will need gearing.
Also you will need to replace the encoder if it is faulty, and i would look at US digital as a cheap source for encoders.
As for if they are suitible or not that will need further investigation.

Ok, new question...

I am looking at getting my motors and dont know how to spec them.

i have been offered a couple of free mclennan M500 servo motors (without gearboxes) http://www.mclennan.co.uk/datasheets...reddcmotor.pdf

They need repair (positional optics parts) but are free

are they suitable?

what spec do i need for medium duty >400mm travel?

[richb77]

Thanks for the replies guys.

I think 0.15Nm isnt enough and they are pretty big without gearing.

Now i am thinking to repair these and gear them will be more costly than buying say 3Nm Nema 23 steppers?

Although accuracy is good i doubt very much i will need much below 0.25mm (and thats being REALLY tight for hobby use).

I may pass on the servos and just get the steppers.

Cheers again

[Smiler]

Hi Rich,

Don't wait too long mate, prices seem to be rising alarmingly.

The stepper kit I bought from Zapp only a few months ago has gone from £206 to £289!

[Gary]

Yes prices are going up, and this is due to the US dollar to the pound changing.
Only 6 months ago it was over $2 to the pound.
I just paid $5000 to my supplier in china and got $1.48 to the pound.

The rate is causing prices everywere to go up.
The drivers have just gone up, and i suspect motors to go up very soon.

I noticed prices all round increasing just lately :(