CNC benchtop PM-25 Milling Machine

[@donaldhollingsworth3875]

From my experience machining Rene 88, Inconel 718, & Titanium T6 & T17 for rotating parts in aircraft engines. We ran some of our milling machines at 10,000 - 20,000 RPM with a depth of cut of .010 using both carbide end mils & TiN coated end mills. You could use either a carbide, or better, a TiN coated carbide end mill. I would also be using a flood coolant system to improve surface finish & chip removal. The TiN coated end mill will give you longer tool life before you have to have it reground. As you probably know, machining aluminum wears the cutting edge very fast since it is so soft compared to other metals so a faster feed rate works better. To speed up the process you can keep the RPM the same & change your depth of cut to .030-.050 running at .010 IPR leaving .030 stock on for a finish pass. This should be well within the capabilities of the milling machine. And you should be able to achieve at least a 63 to 90 surface finish. You might even be able to increase the spindle speed to 2500 RPM with the same .010 IPR feed rate if you don't run into any chatter problems. I would also start with the straight cut then do the profile. That way you would not have to deal with any blend issues if you have any. This is just my opinion.

[@bobbateson]

I bought the CNC Baron. Really happy with results. My fixtures to hold my parts are usually my weak point. 3000 rpm limits my feedrates to about F60 It has a true 4axis capability.

[@ArizonaVideo99]

What is the CNC Baron?

[@catherineharris4746]

Simply outstanding!👍👍👍

[@ArizonaVideo99]

Thanks

[@Roelasia]

it's not a racing machine but result looks perfect. nice job man.

[@ArizonaVideo99]

The stand is not bolted down and the CAM is for more of a DOC then what would be best. I plan on re doing the setup in the neat future with a new cement base to quiet things down. It will have a built in column support too. Kind of a fun add on.

[@ArizonaVideo99]

I don't have the G0704 up and running right now. There is lots of videos of the 704 out there. Its a good mill and many are happy with it. The PM-25 does come with the belt drive and brushless motor which is real nice and I didn't want to make a belt drive for the little mills just to get some spindle speed. Now that the PM-25 is broken in some I'm going to turn down the pulley a bit to get more speed from it. The question is how much. If I stay around 4k RPM then I can leave the stock TRB bearing in the spindle which I might do. Most of my CAM work is for the larger mill and 1/2" or larger cutter which will don't need 6K to do well but the best setup might be going for 6K RPM and using a 3/8" cutter. That would be a good reason to change to A/C bearings in the spindle. The head is exactly the same on the two mills and the column is about the same. The Z goes higher with the PM-25 and the 704 will allow the head to go lower do to the Z nut mounting. The PM-25 is a bolt on kit where the 704 you have to mill a pocket for the X nut.

[@robertk925]

David, were you ever successful in speeding up the spindle? Thanks!

[@Mike-ff7ib]

Why is the z column bellos not installed.

[@sampitts7044]

So you just sold me conversion. I think it was you.

[@ArizonaVideo99]

My email is [e-mail] and yes I do sell the kits. Looking at paypal I see you got your kit on the 21st Hope all is working good. Thanks Again. Dave

[@Suprised1]

What software are you running? Ever use linux CNC?

[@ArizonaVideo99]

Still Mach3. I bought Acorn systems and will be learning that soon.

[@makosharkcnc7730]

what kind of lube are you using?

[@ArizonaVideo99]

This was just a simple test cut and the mill was not even bolted down and no chip recovery. I used WD40. With the mill properly bolted down and all the slides properly set I could mill much faster. I had a ring from the stand that was bad so I just went super slow. Kits for sale at ArizonaCNCkits.com Thanks Dave

[@ksb2112]

What is going on at 6:52? When the table moves quickly it's as though the whole thing changes geometry and then slowly comes back into normal perspective.

[@protoserge]

It looks like it was at the end of a pass, went to clearance height and performed a rapid to the start of the next pass (see 9:37 for another example).

[@Gracana]

Image stabilization. Makes for weird looking video sometimes.

[@chaley9093]

Question. Why did you tool path cut 1 piece at a time? I would think that one would cut all the pieces on the same path/depth. I am not a true machinist, but I can a machine or 2. CNC and manual. Is that an aluminum cylinder head cut in half for the bed? If so, Yeah recycle those auto parts!

[@ArizonaVideo99]

You can do it both ways. It depends on how you want the chip clearing to go. Sometimes with level first that leaves more pockets for chips. This was not code for the 25 mill anyhow. I had to really slow down the feeds. The mill can do better with a smaller cutter and less DOC and faster feeds. Thanks Dave

[@akbychoice]

Curious if you've ever had a power outage while milling? If so, what issues it has caused while machining with a CNC set up? Thank you.

[@ArizonaVideo99]

I have good power in this part of Phoenix. If I see a really big storm I don't to a big run. If you do loose power everything just stops and you would have to re zero and start the code from the last op. If you have a ruffing clearance you might not even trash the part.

[@wheelsandtime]

Hello, I'm looking for the same machine, would you have the links to the machine and the conversion kit please? Thank you.

[@ArizonaVideo99]

I sell direct so you need to email me at [e-mail]. The website is up but not really working yet. Thanks Dave

[@wheelsandtime]

ArizonaVideo99 thank you , i contact you :)

[@ArizonaVideo99]

You can buy the mill here. www.precisionmatthews.com/shop/pm-25mv/ I sell the CNC kits direct with Paypal. Just email me at [e-mail] Thanks Dave

[@alexsalex1987]

Thanks for all your videos! The question is - what are the final tolerances you were able to reach on aluminum parts? Sorry I am new to milling machines. With right choice of CNC conversion kit, high quality of the tools, collets, vises, etc, is it possibile to hit +-0.001" profile tolerance in all XYZ axes on brass parts that have overall dimensions of 1"x1"x3" using this PM-25MV with CNC? Thank you!

[@ArizonaVideo99]

I would say no. A $50,000 VMC can't do that most the time without special setup like probing. I would say with a little practice you can get to .005". Below that every little thing mater so much.

[@dominic6634]

@@ArizonaVideo99 actually you should be able to hit within .001 with a HAAS or Mori no problem (you don't need a probe just an indicator or good edge finder). If your not its a machining strategy problem or the machine is out of wack. with a CNC conversion with a hobby machine you looking at about .005 or .010 depending the the machine. A Bridgeport conversion should be able to do about .001

[@elonquemattheson6151]

What happened to your way-covers?

[@cncspeakers1664]

I generally replace the stock way covers with EDM rubber. Have not upgraded the 25 yet.

[@andgott]

How do you like that PM mill?? I'm looking at that and the Grizzly 704.

[@frostroxie2740]

What would the mill and CNC up grade roughly cost?

[@ArizonaVideo99]

The Mill runs around $1699 frpm PM and my kit is $799 with re worked ball screws. Thanks Dave

[@cbeck611]

can you do a comparison video of the precision matthews vs a grizzly mill

[@glennedward2201]

cbeck611 I own both PM and Grizzly. Larger machines and both have there points. I will be quite honest my Grizzly g0761 is far more precise than my PM833t and my Grizzly has had far less issues with it. Only thing the Pm has is a better casting and no slop in the column dovetails. Both are rf45 type machines. The PM has far more table travel but the grizzly can also be modified. Frankly for what I spent 1/2 the money on my Grizzly it is superior in cut quality to the PM out of crate. Currently I am converting my PM to CNC because the manual machine is so terrible.

[@larryschweitzer1007]

Even if you turn the RPMs up to 6K that still seems really slow. We mill AL @ 16K and 600"/min. It doesn't seem like the forces on the mill would be much greater since it is the chip load & accelerations that govern that. The controller/software would need to have appropriate ramp accelerations built in. How hard can the PM-25 be pushed?

[@ArizonaVideo99]

The mill is 280 pounds. it wont do what a 1600 RPM 6K pound mill will do

[@user-ks5ff]

Who's 'we' ??

[@ssthirdgen]

Hi there! I am looking at either a PM25 or 30 to convert over to CNC. I am interested in your kits to convert them over. Any details would be awesome! Matt

[@ArizonaVideo99]

Hi Matt. I do kits for both the PM-25 and PM-30, the 30 is dont but not in production but will be. I like the 30 for its size, its a really nice larger mill at 460 pounds. Feel free to email any questions. You can see more pictures here. This is the PM-25. s1294.photobucket.com/user/arizonavideo/library/New%20PM-25 And the PM-30. s1294.photobucket.com/user/arizonavideo/library/PM-30%20Weiss%2030%20BF-30 Thanks Dave [e-mail]

[@lukedragoo1618]

Are you still selling conversion kits? I saw on some forums that you sold kits, and one post that said you were making a kit for the PM30MV. Where can I go to find these kits for sale? Thanks

[@ArizonaVideo99]

I do direct sales. I will be selling the PM-30 kit this summer, they changed the mill some so the kit I made a few years ago needs mods. Just email me at [e-mail]. Thanks Dave

[@selbenater]

im really interested in getting one of your cnc conversion kits for the PM-25MV. How would i go abouy purchasing one? Also, do you have a recommendation for a stepper motor and controller kit for this mill? thanks!

[@ArizonaVideo99]

I sell direct using Paypal. Matt sends me lot of biz for the PM-25. Email me at [e-mail] Thanks Dave

[@selbenater]

ArizonaVideo99 Thanks for the reply! Any recommendations for a stepper motor and controller kit?

[@ArizonaVideo99]

The 570 oz steppers are really great. I use them for almost everything. www.automationtechnologiesinc.com/products-page/nema-23/nema-23-three_eighths-inch-dual-shaft-with-a-flat-570-oz-in/

[@selbenater]

Thank you, I'll check it out!

[@effyou128]

Do it all your self There are so many cnc videos online Step by step If you are converting one you should be able to mill a few motor mounts. Buy nema 34s acme thread 3 power suplys 3 stepper drives 3 stepper motors mach 4 and you're all set to go $400 at the most DO NOT BUY A CONVERSION KIT They rob you badly they charge 3-5 Grand for a kit they will cost you only a couple hundred if you part it out. If someone cant mill some stepper mottor mounts then why do they have a mill in the first place If you have a lathe even better make your own threaded rod.

[@kamleshkumartoolmakingjoob13]

How much does this machine cost

[@Mike-ff7ib]

About $2000 depending where you buy it.

[@algarcia3845]

Hi Dave I am interesting to buy a CNC kit for a PM-25MV milling machine. Also I want to buy the software. Please send me a quote. Regards

[@ArizonaVideo99]

I just sell the ball screw kits. I have pictures here. s1294.photobucket.com/user/arizonavideo/library/New%20PM-25 For more info you can email at [e-mail] Thanks Dave

[@algarcia3845]

what is the price for the kit? your email not works

[@miltonma4910]

do you think it can mill steel ?

[@jcjimenez5327]

Hi Dave what’s your email or from of contact I have a few questions I would like to ask Thanks Jc

[@ArizonaVideo99]

[e-mail]

[@ArizonaVideo99]

My email does work. Try it again, I answer them all day long. [e-mail] Thanks Dave