PM-728 CNC Conversion Final Results?

[sunrise305]

I have seen numerous posts discussing the details of converting a PM-728 mill to CNC. But there is little posted in the way of end results. For those of you who have gone down this path, how did you end up? Did you fully complete the conversion? if so, are you happy with the performance of the final product? Could the money spent been better invested in a different solution such as a purpose-built CNC mill? If you had to do it over again, would you do anything differently? Thanks in advance for your feedback which may prove invaluable to those of use contemplating the same journey.

 

[jdm033056]

Following for I am heading down this road....

 

[matthewsx]

I don't have this machine so take what I have to say with a grain of salt.

I don't think you can compare this conversion to a real VMC (purpose built vertical machining center). Would money be better spent on a commercial VMC, or even something hobby class like a Tormach really comes down to what your goals are and how much space & power you have in your shop.

Do you already own the PM and are itching to do a conversion? If so I think you already have your answer....

If not do you have the space for a commercial mill? There are definitely deals to be had on machines which need new controls, this may feed your desire to do a "conversion" at it can be a significant undertaking that will result in a very stout machine tool. There are also Bridgeport style mills originally sold as CNC that come up frequently for decent deals.

Take a look @JimDawson for many threads and advice on how to do this.

Good question to ask BEFORE you jump into the rabbit hole....

John

 

[hman]

I've been planning to build up a CNC mill for somebody for whom I've built a couple of other projects.

What Did You Buy Today?

I don’t know how much use you’ll get out of the hand grinder…..

www.hobby-machinist.com

Made in America - once upon a ..

Its surprising who owns the plethora of power tools available today. https://clevercreations.org/top-tool-manufacturers-who-owns-brands/ I saw this link some time ago and was amazed at how many brands are owned by so few players.

www.hobby-machinist.com

The best "starting" candidate I could find was the Taig 2019 CR(CNC ready) mill.

2019CR Micro Mill - TAIG Tools

2019 converted to CNC ready with Nema 23 motor mounts, adjustable bronze leadscrew nuts, and upgraded 1/4 horse power motor . Does not include stepper motors or control system.

taigtools.com

Though not large(XYZ travels of 12", 5.5" and 6", it's basically a nice stout mill. The preliminary budget came to just over $2500 for everything. After buying the mill, I've gone on to buy the steppers, controllers, Centroid Acorn board, home sensors and enclosure parts. I plan to take lots of photos, document the build, write up an article, and submit it to Digital Machinist.