Just finishing the conversion of a PM-30 to CNC with the Clearpath Servos. I priced the CPSK motors to closed loop steppers with almost equal force and power and the CP servos are a lower total cost by about $10. I could have lower the cost by building a single 70V power supply in place of the two Teknic PS units I bought for the system. So happy with the performance so far. The next build will be a gantry router to replace the X-Carve that I have in the shop. Plan to use the Acorn and the Clear Path servos for that machine I have watched many of your videos - learned about the Acorn from your videos. Thanks for the ideas and good comments.
@Brandon SmithClearPath are great and they provide true servo technology - but they are not cheaper than closed loop steppers. I don't have all the pricing information at my fingertips but this video may be useful: ua-cam.com/video/dvbsIgrwl1U/v-deo.html
Two servos on the same axis will fight for position. Tiny variances in lead on the leadscrew, will make cause one side to push or pull against the other side. This is what causes the humming. My guess is, that the slider adjust how hard it will try to maintain a steady position. “Quiet” probably allows the encoder to be a few positions off, as long as it doesn’t creep.
Never owned a CNC machine but that's what I figured was the issue. I'd assume he's giving up a slight accuracy for it to be quiet, machine is not square by a tiny fraction.
Great to hear that you’ve been enjoying setting up the Clearpath steppers. Currently have some el cheapo nema 23 260oz steppers on my router, considering either going Clearpath or DMM DYN2 with their servos. Your thoughts? Hoping for not only positional accuracy but greater acceleration and federate for 3D and high speed toolpaths.
After using both, I'd go with ClearPath before DMM. But, they are both good. I just like how easy it is to make the ClearPath stuff work - very user friendly.
Hi Franco, as always - great video! What did you do for braking the Z-Axis with the Clearpath so that it doesn't crash into the table in case of a power off? I've got my Acorn and Clearpath servos ordered
Do you thing it is possible to mount Clearpath motor from the motor chassis itself? I know that there are typical 4 screws form nema23 motors, but are there any other mounting possibility outside those?
I had the same hum with DMM servos, solution was the same. I emailed DMM and they said it was related to the backlash in my system. Not sure I understood fully...
Hello Franco, Sorry to bother with that but I'm still scratching my head and can't find anywhere an answer. What size or configuration would you recomend for a small shop workbench of 33'x48' ? A 750X 1000Y CNC or a 1000X 750Y? Tanks again
Because Y1 and Y2 are mechanically tied to the same gantry, there is no way to move them (auto tune) them independently. The best you can do is to remove some of the mass, auto tune X axis and use that set of data as a starting point for the Y axis motors. This is the recommended method.
1000x1000. But, you don't actually get that much working travel. I wouldn't buy anything wider than the 1000mm frame as the x-axis beam becomes too long and gets to be sort of flimsy. The 1000mm length on the x-axis beam seems to be good.
Thanks a lot Franco! There this new Queenbee upgrade kit (CNC3D or Bulkman3D) with reinforced C-beam where the empty space inside the C-Beam has been filled in to make a rigid 8040 profile and along with lenar rails seems to be a good option to strenghen this CNC...
@@Levisgil47 Good question. It's actually good if the Y-axis rails on the left and right of the machine overhang the table. That way, you won't have to worry about dust and chips packing up between the table and the moving parts. My table was 4' x 4'. A bit larger than necessary.
The hum is called encoder resonance. It happens when motor bounces back and forth between 2 points in the encoder
Just finishing the conversion of a PM-30 to CNC with the Clearpath Servos. I priced the CPSK motors to closed loop steppers with almost equal force and power and the CP servos are a lower total cost by about $10. I could have lower the cost by building a single 70V power supply in place of the two Teknic PS units I bought for the system. So happy with the performance so far. The next build will be a gantry router to replace the X-Carve that I have in the shop. Plan to use the Acorn and the Clear Path servos for that machine
I have watched many of your videos - learned about the Acorn from your videos. Thanks for the ideas and good comments.
Awesome! I'm gald I could help.
@Brandon SmithClearPath are great and they provide true servo technology - but they are not cheaper than closed loop steppers. I don't have all the pricing information at my fingertips but this video may be useful: ua-cam.com/video/dvbsIgrwl1U/v-deo.html
Informative as always!
Thanks!
Two servos on the same axis will fight for position. Tiny variances in lead on the leadscrew, will make cause one side to push or pull against the other side. This is what causes the humming. My guess is, that the slider adjust how hard it will try to maintain a steady position. “Quiet” probably allows the encoder to be a few positions off, as long as it doesn’t creep.
Never owned a CNC machine but that's what I figured was the issue. I'd assume he's giving up a slight accuracy for it to be quiet, machine is not square by a tiny fraction.
Great to hear that you’ve been enjoying setting up the Clearpath steppers. Currently have some el cheapo nema 23 260oz steppers on my router, considering either going Clearpath or DMM DYN2 with their servos. Your thoughts? Hoping for not only positional accuracy but greater acceleration and federate for 3D and high speed toolpaths.
After using both, I'd go with ClearPath before DMM. But, they are both good. I just like how easy it is to make the ClearPath stuff work - very user friendly.
Hi Franco, as always - great video! What did you do for braking the Z-Axis with the Clearpath so that it doesn't crash into the table in case of a power off? I've got my Acorn and Clearpath servos ordered
Interestingly, that wasn't an issue for me. My head did not drop when the power was cut.
Do you thing it is possible to mount Clearpath motor from the motor chassis itself?
I know that there are typical 4 screws form nema23 motors, but are there any other mounting possibility outside those?
I had the same hum with DMM servos, solution was the same. I emailed DMM and they said it was related to the backlash in my system. Not sure I understood fully...
Hi franco, which controller car do u use?
Hello Franco, Sorry to bother with that but I'm still scratching my head and can't find anywhere an answer.
What size or configuration would you recomend for a small shop workbench of 33'x48' ?
A 750X 1000Y CNC or a 1000X 750Y?
Tanks again
Hi. My 1000x1000 fit on a 48"x48" bench with some room to spare.
I don't understand why you are loading the xaxis data to the y axis motors? Is this the recommended way of tuning the yaxis?
Because Y1 and Y2 are mechanically tied to the same gantry, there is no way to move them (auto tune) them independently. The best you can do is to remove some of the mass, auto tune X axis and use that set of data as a starting point for the Y axis motors. This is the recommended method.
How much $ do you have in the build?
What site did you purchase the CNC from?
watch this previous videos. It is a workbee cnc but he didn't buy it from them but instead bought the gantry from china clone company.
I purchased it from eBay. Search for WorkBee and look for a seller called BulkMan. It came from China.
What size is it? 1000x1000mm or 1500x1500mm. Happy with this size? Thanks
1000x1000. But, you don't actually get that much working travel. I wouldn't buy anything wider than the 1000mm frame as the x-axis beam becomes too long and gets to be sort of flimsy. The 1000mm length on the x-axis beam seems to be good.
Thanks a lot Franco! There this new Queenbee upgrade kit (CNC3D or Bulkman3D) with reinforced C-beam where the empty space inside the C-Beam has been filled in to make a rigid 8040 profile and along with lenar rails seems to be a good option to strenghen this CNC...
@@Levisgil47 That is too cool! Thanks for sharing.
@@FrancoCNC Do you mind asking the size of your table. How much more than the size of the CNC Frame to pick? Thanks
@@Levisgil47 Good question. It's actually good if the Y-axis rails on the left and right of the machine overhang the table. That way, you won't have to worry about dust and chips packing up between the table and the moving parts. My table was 4' x 4'. A bit larger than necessary.