Clearpath or DMM

**Neale** · 01-04-2021

I think it's too late as you've decided already, but I've just found the info I have on the Clearpath servos I have on my own mill which is similar in size to the WM18. I have a Wabeco F1410-LF. Couple of things to bear in mind. The mass of the tables is probably not that different and that is a fairly significant factore in the torque needed to accelerate the mass up to speed - and to slow it down again. However, my machine also has Hiwin (or maybe Hiwin-style) profile rails so the actual moving friction will be much less than the corresponding dovetail slides on the Warco machine, and that can be a significant load once the table is moving. I also have ballscrews fitted, but I am assuming that you will do likewise with the Warco. My machine has a sliding head (also on profile rails) which probably weighs around 30kg, but is counter-balanced by a smaller weight held on cables behind the column. In this case, moving friction is low and the servo does not have significantly different loads depending on the direction of head movement (gravity with/against) but the moving mass has quite a lot more momentum to get moving.

Anyway, my machine has, I believe, three identical servos. These are CPM-SDSK-3411S which have a nominal constant torque of 1.1Nm and peak torque 4.5Nm (according to the data sheet). In practice, these seem to work very nicely on this machine. Your XY servos appear to be 2.0/7.7. Given the greater friction involved and the fact that mills don't need the same acceleration in general as routers, the bigger frame size and inertia is probably not very relevant and they look fairly well-suited.

Not sure if this is of any real interest but I thought that you might like a data point taken from a real machine to reassure you in your choice! Good luck with the project - I ended up buying this machine at a good price second-hand as I wasn't sure I wanted to spend the time and effort modifying my own Warco VMC.

**xzsawq21** · 30-10-2021

Originally Posted by Neale

I think it's too late as you've decided already, but I've just found the info I have on the Clearpath servos I have on my own mill which is similar in size to the WM18. I have a Wabeco F1410-LF. Couple of things to bear in mind. The mass of the tables is probably not that different and that is a fairly significant factore in the torque needed to accelerate the mass up to speed - and to slow it down again. However, my machine also has Hiwin (or maybe Hiwin-style) profile rails so the actual moving friction will be much less than the corresponding dovetail slides on the Warco machine, and that can be a significant load once the table is moving. I also have ballscrews fitted, but I am assuming that you will do likewise with the Warco. My machine has a sliding head (also on profile rails) which probably weighs around 30kg, but is counter-balanced by a smaller weight held on cables behind the column. In this case, moving friction is low and the servo does not have significantly different loads depending on the direction of head movement (gravity with/against) but the moving mass has quite a lot more momentum to get moving.

Anyway, my machine has, I believe, three identical servos. These are CPM-SDSK-3411S which have a nominal constant torque of 1.1Nm and peak torque 4.5Nm (according to the data sheet). In practice, these seem to work very nicely on this machine. Your XY servos appear to be 2.0/7.7. Given the greater friction involved and the fact that mills don't need the same acceleration in general as routers, the bigger frame size and inertia is probably not very relevant and they look fairly well-suited.

Not sure if this is of any real interest but I thought that you might like a data point taken from a real machine to reassure you in your choice! Good luck with the project - I ended up buying this machine at a good price second-hand as I wasn't sure I wanted to spend the time and effort modifying my own Warco VMC.

Dear
I'm gonna buy a WABECO F1210 milling machine with WABECO Ballscrews.
https://www.wabeco-remscheid.de/fras...pindeln-1.html
and I need to have 4th axis:
https://www.wabeco-remscheid.de/1647.html

Can I use CPM-SDSK-3411S motors for XYZ and A Axes or it's better to use SDSK-3421S? I want to produce Aluminum/Brass/Steel things for the local companies.
Thanks

**dazp1976** · 31-10-2021

Originally Posted by xzsawq21

Dear
I'm gonna buy a WABECO F1210 milling machine with WABECO Ballscrews.
https://www.wabeco-remscheid.de/fras...pindeln-1.html
and I need to have 4th axis:
https://www.wabeco-remscheid.de/1647.html

Can I use CPM-SDSK-3411S motors for XYZ and A Axes or it's better to use SDSK-3421S? I want to produce Aluminum/Brass/Steel things for the local companies.
Thanks

Seems expensive.
Y axis is a bit short on travel and I wouldn't touch MT2 taper with a bargepole. You want the SK30.
For cnc work 3000rpm is low. You want/need the higher speed one.
Seems ballscrew nuts are single judging the pdf manual. I'd want double nutted ballscrews of at least C5.

Manual machines with standard trapezoid screws at this spec can be <£1400. This means you're paying around £5.5k to £6.5k+ just for the conversion. Seems a bit much.

**xzsawq21** · 31-10-2021

Originally Posted by dazp1976

Seems expensive.
Y axis is a bit short on travel and I wouldn't touch MT2 taper with a bargepole. You want the SK30.
For cnc work 3000rpm is low. You want/need the higher speed one.
Seems ballscrew nuts are single judging the pdf manual. I'd want double nutted ballscrews of at least C5.

Manual machines with standard trapezoid screws at this spec can be <£1400. This means you're paying around £5.5k to £6.5k+ just for the conversion. Seems a bit much.