Drilling machine

[tonyfoale]

Vyacheslav,
I love how you make nice things from near nothing. I did the same in my youth.
I would echo the same comment that Al made about a brace on the main column. It would be easy to have a bolt on one which went back to the wall, then you could still remove the head if necessary.

[Ed Weldon]

Elegant. 3 tools needed to fabricate. Angle grinder, welder and piece of carbide to shape angle grinder disk for gear teeth. Two questions-- 1. How to hold spindle ball bearings inside square tube? 2. What is size or part number of ball bearings?

[owen moore]

You sir, are a true innovator.

[mwmkravchenko]

Elegant. 3 tools needed to fabricate. Angle grinder, welder and piece of carbide to shape angle grinder disk for gear teeth. Two questions-- 1. How to hold spindle ball bearings inside square tube? 2. What is size or part number of ball bearings?

Could be a quick tack weld on the corner. Would not do much damage if any to the bearing and hold it in place.

[Ed Weldon]

I would not recommend any attempt to weld on or near a functional part of an expensive ball bearing. There are other ways to accomplish the locating and confining rotation of an outer ball bearing race that do not risk physical distortion of its geometry. In a shop with scarce resources 4 small carefully carved wood wedges (with locking tapers in the inside corner openings of the square tube) anchored with some tree sap would work. Personally I'd prefer making those more or less triangular spacers from steel with a close slip fit and retaining them with a minimum of epoxy adhesive. When bearing replacement is required application of heat at about 200C will cause the epoxy to break down and be easily cleaned off the spacers and the inside of the tube.

[tonyfoale]

I would not recommend any attempt to weld on or near a functional part of an expensive ball bearing.

Add my vote to that.

[Frank S]

While I have numerous times tack welded bearing races to or in parts this is only done on when things I term single use throw away get it done and move on. I would never consider tack welding to a bearing race that was needed to last for any period of time. Its not good to even allow stray current to pass through a bearing