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Mill/drill stand for Warco Major mill

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BillTodd:
You've probably seen these but, they might be of interest...

My wish bone stabiliser and other mods:(google drive link)

https://drive.google.com/open?id=1OjOu4MyoHSMjD6ye6uOr8ufP5PBJ01GG

https://www.cnczone.com/forums/uncategorised-metalworking-machines/70099-wishbone-stabiliser-round-post-drill-mill.html

https://www.cnczone.com/forums/uncategorised-metalworking-machines/89480-cvt-continuously-variable-drive-rf30-type-drill.html


And roller-nuts for the lead screws (over several pages buried in an enormous thread about alternative to ball-screws)

https://www.cnczone.com/forums/linear-and-rotary-motion/13593-forum-post521360.html#post521360

PekkaNF:
Thank you Bill. Those were good links. You have done excelent work.

 I have seen the wishbone stabilizer long time ago and I like the idea. However it does not look very straightforward get it "perfect". You state "better than +/- 10thou" for radial accuracy , which translates +/-0,254 mm, sounds reasonable for drilling.

https://www.cnczone.com/forums/uncategorised-metalworking-machines/70099-wishbone-stabiliser-round-post-drill-mill-4.html

I really don't know yet if this loss of register is real problem to me or not.

Pekka

chipenter:
I have only had a problem with large mt drills after a pilot hole just takes a little longer to get it right , or just bolt the rack to the column .

BillTodd:
[quote author=PekkaNF link=topic=12667.msg151382#msg151382 date=1533420635

 I have seen the wishbone stabilizer long time ago and I like the idea. However it does not look very straightforward get it "perfect". You state "better than +/- 10thou" for radial accuracy , which translates +/-0,254 mm, sounds reasonable for drilling.

Pekka
[/quote]

If I were to remake it, I would place the upper and lower pivots in front of or behind the post , so that they could be linked by a straight rod . That way ,as long as the arms are all the same length it track accurately. The one i built was too adjustable.


In use , the verticle alignment was always good enough for drilling . the machines are not really rigid enough for accurate milling without a great deal of care.

if you use er collets , the spindle brake is indispensable.
 

PekkaNF:
Thank you Bill, good information!

I am tempred to consider that wishbone stabilizer.

I saw that spidle brake on your video.

I have ER collets and arbors, I use dedicated spanner to hold the arbor and ER-key to use them. I use many of them on lathe tail stock too, both have MT3 taper.

I have a lot MT3 taper tooling, most of it M12 thread, few 3/8" Whit and many tang end drills.

This brings me to drawbar tooling ejection. My current machine has plain taper bearings and giving a whak to it fine, but this mill has rolling bearings and I really dislike idea of brinneling the bearings. I have seen some differential thread or retainers to make it possible to use drawbar to release the taper from spindle. Looks like there is enough meat at the end of spindle for thread (differential thread or bushing to retain the drawbar).

The threaded retainer bushing would be very straightforward if I only would use tooling without tangs, but drills tend to have tangs.

Have to see first which tooling is essential, count them, check drabar thread and "gage length" and then I can make educated guess.

Pekka

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