Thread: CVA mill

The pics

It is the 5 speed model and it has the #3 morse spindle . It is far more rigid than my DM45 is so it should handle some heavier work Mike

Originally Posted by morrisman

The pics

It is the 5 speed model and it has the #3 morse spindle . It is far more rigid than my DM45 is so it should handle some heavier work Mike

very nice Mike.
how did you get it home ? did you driver up there to pick up ?
regards
peter

Looks like a bit of bush engineering going on there, good old cocky wire holding things together. I'd say a restoration job is required.
Nice looking machine though.
Kryn

Originally Posted by thorens

very nice Mike.
how did you get it home ? did you driver up there to pick up ?
regards
peter

I used e-go ( hunter express ) to get it down here , didn't cost much to move it because its not a very wide or deep item, the weight doesn't seem to matter to them . The seller sat it on a pallet and wired it down . It is a very top heavy machine , and it would probably topple over very easily because the base/foot has such a small footprint . The machine has a solid feel to it , so much better than the flimsy 45 mill drill Ive been using

G'day Mike,
That's a nice looking machine you've got yourself there.
Looks like it has a pretty handy work envelope for a machine with such a small footprint.
Nice pickup mate.
Cheers,
Greg.

Beautiful mill. I talked a friend into buying a CVA lathe which is a wonderful piece of gear. Heavy and accurate and no expense was spared in making it price.

Paul.

An update

Ive had the table ground . And today removed the Y axis lead screw and nut as it has substantial wear . I like the clever design of this milling machine , it allows you to remove the leadscrew and nut without disassembling any major bits . The acme thread is 7/8" and 5 tpi .. I will have a go at making a new leadscrew and nut

Mike

Well I have another cva mill in my trailer.

Originally Posted by welder

Well I have another cva mill in my trailer.

Well done ! We can compare the ins and outs of these nice mills . I spent today trying to make a new Y axis leadscrew, the little Sheraton late struggled and the threading process turned into a complete mess . Despite roughing out the thread with a tool, the 3/4 hp motor stalled a few times during the plunge cutting with a sharp acme form tool . I will have another attempt on a larger lathe with more stability and power .Mike

How much backlash do you have mine has about 1/4 turn on x and y. Mine also had the six wires so I can hook up to the vfd photos next week.

Originally Posted by welder

How much backlash do you have mine has about 1/4 turn on x and y. Mine also had the six wires so I can hook up to the vfd photos next week.

Same with mine, about 1/4 turn on the Y and about 1/3 on the X .

I am going to cut the original leadscrew forward end off, and drill a hole into it . Then machine a spigot onto the new ACME leadscrew section and loctite it in to the original forward / handle end . OK sounds like the motor can be set up for Delta 240 3 phase . Look forward to the pics

BTW Im going to try this http://bbs.homeshopmachinist.net/thr...s-the-easy-way



Mike

Hi Mike,

Whats wrong with the leadscrew? Just wear?

Stuart

Originally Posted by Stustoys

Hi Mike,

Whats wrong with the leadscrew? Just wear?

Stuart

hi

Yes , the Y lead screw is worn in the middle, where most lead screws wear The ends of the screw are ok , you can see the thinner worn threads in themiddle . The long bronze nut will be worn as well. Will be interesting doingthe replacement acetal nut trick - May take a few trial attempts before I workout how to do it

Hi Mike,

Bearing in mind I cant see how worn your leadscrew is and I've never done this.
Assuming most of the wear is in the nut and only a little in the screw. As you are making your own nut to suit, you dont care if your thread form it a little off.
Would it be a completely stupid idea to try recutting the screw you have(possibly grinding the thread if you have a TPG)?
You dont have much to loose.

Stuart