Advice sought on new Mill build

[Boyan Silyavski]

About the motor.
I don't know how realistic that could be. The data i mean and if it could serve well. Somebody has already tried it? For that purpose? Do your research there. Dont believe what chinese sellers say, cause mostly they don't know a sh*t about what they sell.

I would believe a similar Panasonic one/ what seemed the right one to me, look at the description/ would be jump in the known, not the unknown. Or just search more to find something more suitable for what you want, brand name.

Ask the seller of the spindle if he knows of a suitable motor. Ask linearmotionbearing , bstautomation and any other seller who seems credible and then decide.

[embraced]

The seller is an OEM manufacturer for machines in China. They manufacture the motor. The same motor is used in many chinese VMC's.

It is not a normal servo anyway. it's an asynchronous servo with forced air cooling. All the real machines have these.
This type motor was recommended by the spindle supplier i might add.

The Panasonic servo you've linked is an axis servo. Not designed to power a spindle.

Also, linear & BST automation don't supply these motors. Their existence is not well known among hobbyists, and they're expensive to boot.

[embraced]

This is the motor manufacturer's website.

http://www.sotengcnc.com/cncsystemsltd-product.html

I have contacted them on many occasions and they certainly do know what they're talking about. They were even able to tell me which EMC standards their drivers passed.

[Boyan Silyavski]

That's good to know. Cause what i hate most is looking at manual in Chinese and nobody to ask for help in English.


Myself and believe others would be very grateful if you continue your build log here with details and so. i would especially appreciate if you share in the future the CAD drawing of the head assembly with the motor, spindle and tool release mechanism. This could save many hours of research and drawing.

[embraced]

Yes, everything will be documented here.

I have found a VMC frame from China that seems to be around my specifications
http://www.alibaba.com/product-detai...904489677.html

The seller I have contacted (not the one above) will sell the frame my itself.
The 'Frame' includes the Spindle, HIWIN guides, P3 ballscrews, auto lubrication system and way covers for 7300USD. the ATC is a 1700USD option.

I have given some thought to either:

• Making a fabricated steel clone of the machine above
• Buying the frame and doing the electronics (not a creative project at all)
• Sticking to my initial idea and doing the entire thing from scratch.

The first option is likely to be the cheapest.
The second option is definitely going to be the easiest and quickest, but the least satisfying.
The last option is one that has the least probability of success, but the most satisfying.


Thoughts?

[Boyan Silyavski]

rails and ball screws at the most will be 1500$
motor , spindle and so 2000$
500-700kg of steel 700$
mig wire, gas and so 200$
epoxy paint and so 200$
additional stuff 1000$
servo motors 1500$

That in worst case scenario, if you are careful with the design it will be more cheaper.

BUT:
-the machine would be exactly as you want it
-better built than the Chinese frame.
-Cheaper
-a lot of small things would be right, that makes a machine GREAT

Dont copy all,use it as guide lines only, build it from scratch and i assure you it will work. It seems you have done quite some research already. Plus one day next time you will like something like this , which you can buy or make your self. So why not from now plan how will fit and be prepared. The Chinese frame will not allow it without sacrificing something.

[JAZZCNC]

No brainer to me buy the frame.!!

You won't make it for less by the time you factor in machine time for grinding surfaces etc. Then you have all the time invested which will be many many weeks. With this you'll be up and working in fraction of time and making money.!

Then you have things like Class 3 ballscrews these shouldn't be confused with the cheap Class7 we buy. If indeed they are Class 3 then they will cost much more and $1500 would just about cover the screws and not rails as well like Boyan suggests.

BUT all this said if your going to this trouble have you thought about buying a second hand VMC. You can often find second hand VMC with dead or absolete Controllers that are perfect for conversion. Even with older ones that have many hours use and worn the structure is still perfectly fine and substantial.
Change the worn parts for new refit with new controller. Often you can reuse servo's and Scales etc even if they are analog drives etc.

You'll get a much better professinal machine for less or same money you'll spend doing this to this level and when done it will be worth double you invested.!!

[Boyan Silyavski]

Unfortunately/or fortunately :-)/ Dean is darn right. Thats why we see so little mill builds from scratch and mostly they are in the smallish range. Moneywise that is Unbeatable, to buy something like Deans VMC and refurbish it. No way that you can do something even similar for the money.