Видео

End to end, the feet span about 44.75". The headstock foot is 5.25" in X and 6.375" in Z. The tailstock foot is 5.25" in X and 4" in Z. Hope that helps.

@@hobbymachining4295 omg your the best! Thank you!!!

Ummmm What about Precision Matthews website?

@@physicsguybrian They have other models, reduced versions, look like this one is discontinued

looks like something from fusion 360 under the High efficiency settings. though there are a lot of other CAM programs out there like mastercam and bobcam

There is no code for it yet. The tool changer is going through a redesign and it is possible the control will change.

It is all right here: www.hobby-machinist.com/threads/new-pm-25mv-mill.65939/

I believe it is currently set for 60 in/s^2.

It may sound like they are smoother, but I think that is just because the servos are much quieter and much faster, so the ballscrews make more noise and it isn't covered up by the stepper noise. I can assure you the servos are significantly smoother running than the steppers.

They are from VXB bearings if I remember right and are 7007B and 7005B. I think they are rated at 9500 and 13000 RPM, and don't seem to have any problem running at 10K for ~1 hour at a time. I am holding them with some home made talon clamps, which only hold on to the bottom .06", but they bite into the material so it won't go anywhere.

@@hobbymachining4295 Thanks!

I used a regular socket head cap screw to lock the spindle cartridge in place, then removed a pin from the front of the head that was holding the handle a spline in place for moving the spindle cartridge up and down. With those both removed, I removed the upper barrel assembly (the thing with the 2 big bearings above the spindle). Then a made a plate that screws into the top of the head and has a pocket for a single bearing to support the top of the spindle. This plate holds the pneumatic cylinder and spindle motor as well. Last, a new pulley was made to fit directly to the spindle shaft and the new bearing. I have used it this way for about a year now and have had no issues.

Thank you. I think I found your build thread on a forum.

I did not get the one with the DRO, though I think a DRO would be very useful. It is hard to say if it is worth the $500 as the DRO itself probably costs around $200-$300. The installation costs are a bit high in my opinion, but then you don't need to figure out yourself how to mount them. Personally, I would buy the DRO separate and spend the extra few hundred on more tooling.

Those are the stock chucks that came with the machine, there is no brand information on them so I can't say for sure. Runout isn't bad, though I am not sure what the correct way to measure the runout of a chuck is. I can get things running within .001" without much trouble generally.

Hobby Machining Put a gauge pin in the 3 jaw then measure the cylindrical part of the gauge block with a dial indicator. 4 jaw is pointless because of its versatility.

@@trainman53714 jaws are definitely not pointless. You can clamp on parts offset or even square or rectangular parts. You can dial in a 4 jaw more perfect than a 3 jaw as well. Very useful tool if you know how to use it.

I absolutely agree with you. I made that comment before I went to trade school and got to use a 4 jaw lol. Very useful chucks! @@Levite92

I am not sure what you mean, but the motors all have the most torque when going slow. They will put out 382 oz in while moving slowly, and the spindle motor will put out around 8Nm spinning slowly, so in theory, it can cut as slow as I want it to. Machine rigidity would be the limiting factor long before motor torque.

@@hobbymachining4295 i found that servo dont have much torque on slow speed and mostly you need to use reduction with gears or pulley. But I didnt try those clear path but I saw John from NYCNC had issue like that.

I haven't gotten that far yet, but it will use a hall sensor to locate tool 1 on start up.

@@hobbymachining4295 how is a hall sensor going to know which tool is number 1? unless tool 1 has a nub on a finger or something that no other tool has. i suppose that would work. You could just stick an absolute encoder on there and be done with it. But that might take a little more work on the coding side.

@@DieselRamcharger Tool 1 will have a magnet on the platter that the hall sensor will detect. An encoder would work, but I think that will be overkill just for homing.

I can't say for sure, but I think it could be made to fit. It would definitely be a bit on the large side. Though the machine comes with an AXA tool post installed and 5 holders, so you would not come out ahead much trying to get the BXA to fit.

Unfortunately, I cannot. There is a chance I will be licensing the design to someone who will manufacture it.

I have CPM-SDSK-2321S-RLN on the X and Y and CPM-SDSK-3421P-RLN for the Z. The 940 is a lot heavier than the PM-25, so you will probably need some stronger ones.

The spindle motor was replaced with a 2 HP AC servo motor. It is a 6000 RPM motor and the spindle will go as high as 10,000 intermittently. I simply removed the old motor, made a mount for the new one, and put the new one on. I had to open up the motor pulley a little bit because the servo had a slightly larger shaft. The spindle also has AC bearings instead of the tapered rollers and I removed the quill and the 2 larger bearings associated with that.

@@hobbymachining4295 Thanks for the explanation. I'm looking into picking up a PM-25MV and doing the CNC conversion, but the slower spindle was a bit worrying but it's cool to see this setup working well. Thanks!

@@thematthewknot You're welcome. The first video I posted of this machine has the stock motor on it to give you an idea of how that one ran. I sped it up to 5500 RPM with the stock motor.

@@hobbymachining4295 Cool thanks i'll check that out, how did you get upto 5500RPM on the stock one?

@@thematthewknot I made new pulleys giving me a 2.2:1 ratio. Motor at 2500 gave me 5500 on the spindle.

I should have been more clear. 180 IPM was max with the steppers. With the servos, it currently maxes at 400 IPM. With a new power supply, I may be able to bump it as high as 600. I just use soft limits. No limit switches to fail. The servos use hard limits to home, so no home switches need either.

The end mill in this video was a 3 flute .75" insert end mill. Thank you for watching. :)

@@hobbymachining4295 I can get a rough idea of the size the end mill, but it helps to understand what the machine is actually doing. As mentioned a Good Demonstration. Looking forward to watching your current and future video,s. Thanks for the reply. Regards Peter.

Ikr, sounds like the 13 inch south bends that used to be in my high schools shop

It has a 6000 RPM servo motor to replace the stock spindle motor, angular contact bearings to replace the tapered roller bearings, and the bearings in the quill assembly were removed and replaced with a single bearing supporting the top of the spindle shaft. I also made new pulleys and replaced a few other spindle parts, but those were to make the pneumatic draw bar work. As it is configured, it can reach 13,200 RPMs, but the spindle can't handle much more than 7500 without vibrating violently. It needs some balancing work to speed up further.

Hobby Machining that is super cool and impressive. It gives me hope to see the potential this mill has