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And now a go at a proper worm
Next I had a go at making a worm and housing block.
To start I turned the M12 hob/worm section down to have two
straight end shanks.
To keep everything concentric all of the next few steps had to
be done without removing it from the chuck to keep the worm
dead true. Even self centering chucks fall down at this.
I bored the final worm out to just a smidge over 8mm diameter.
This was then a snug fit over an 8mm piece of steel from an industrial
photocopier.
This 8mm would be the internal shaft the worm slides on to and
gets locked to it with a cotter pin.
I turned a shoulder to fit a ball bearing race and also an M6x1.0
thread for a nylock nut. The thrust race also is clearance on
this shaft.
Next came the housing blocks that the worm assembly would
rotate in.
I machine faced this block in the four jaw and then bored it
to suit the bearing one end and a brass bush the other.
After cutting them down to final size I then milled the rough
face where the hacksaw cut was.
Finally, all assembled except for the worm left off the sleeve
and the blocks not bolted down to a solid plate.
That's the next job.....
Steve
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