The Shop > Tools
Tool Post Grinder
bogstandard:
That way of grooving is an old technique that I showed people how to do when they wanted to make the bending rolls for small tubing benders. It is a perfect method for small half rounds, or even big ones.
Grinding up a round nose tool of exactly the right size and shape for use on the lathe is a real PITA. Doing it on the mill is like a walk in the park, just find the right sized cutter and away you go.
Bogs
sbwhart:
Ok now for the spindle pulley.
So that everything will run concentric, I turned a mandrel that is a nice fit on the bore of the pulley.
Bolted the blank pulley to it.
Then moved the chuck with everything still in place over to the RT and milled the belt grooves as before.
Here's a little tip:- Keys set into shafts can be a bit of a bitch to get hold of to remove, put a little groove in one end of the key so you can prise it out with a small screw driver.
Next job cut some plate out for the base. I'm using some ally jig plate I picked up from the scrappy.
Find a bit of plate that doesn't have an existing hole in a strategic position.
Then with a jig saw with a metal cutting blade and with some help from WD 40 cut the bits out, if any one asks what the extra holes are for I'll tell them its to keep the weight down. 0 ::)
Ok first job with the bits of plate is to clean the burrs off as well as I can.
Then set a parallel up square on the mill table.
And with the best edge hard up against the parallel clean up one edge, then with this cleaned edge up against the parallel clean the next edge up etc etc until all all four edges have been cleaned up are are square with each other, its easyer to start with things square than to try and get them square later.
This is the plate cleaned and squared up, the smaller piece will make the grinding spindle mountings.
And as its always nice to see how things are looking this will give you an idea of how the finished job will look.
Ok thats it for know the Grand prix is on the box the family have bets on which lap I'll fall sleep on, my record is the warmup lap.
:lol: :lol: :lol: :lol:
Stew
bogstandard:
Looking great Stew.
Just think of all those nice precision finishes and truing up you will be able to achieve.
Next time you call round, ask me for a dressing diamond, if you already haven't got one.
John
Darren:
That really is looking quite good now Stew, there is a sewing machine motor for sale near me.
Shame it's attached to the rest of the machine though ..... :doh:
sbwhart:
Ok now to mount the spindle:-
The chunk of plate was cut in half to make the two mounting, the cut ends cleaned up with the two clamped together so that they would be the same length. At each end of the mounting a 1/4 hole was drilled right through and followed by a 10mm drill 20 mm deep to take the head of the cap head, then the base plate was drilled 1/4 BSF:- why BSF well that was the size of the only cap screws I had that were long enough to go through the mountings into the plate.
I used the tapping feature on mY X3 to tap the holes:- getting more confident in doing this.
Now to open up the mounting to take the spindle, I could have done this in the four jaw just clamp the two plate together set them up in the four jaw and drill and bore them out to size as a pair, for a grinding spindle this would have got them close enough on the lathe centre height. But I though I'd do it another way that would get thing dead on centre, this is the best way for any of you making a cross hole drilling sub spindle.
Clamp the base onto the lathe tool post get it square.
Get it positioned clamp the cross slide up, then centre drill followed by bigger and bigger drill, this is the biggest drill in my armory 13/16 " .
Then swap over to the boring head. To start with I took 1 mm ish cuts then as I got closer to size 0.5 mm cuts then 0.25 mm cuts until I was within 0.3 of size then I just ran this cut through 2 or 3 times to take the spring out.
Used the flash on this shot to freeze the action love the curl of swarf.
Thats it a nice snug fit
I may split the mounting down the centre to make pinch clamps on the bearing, but I realy have got a nice fit so I'm thinking of just drilling and tapping for a grub screw to fix things.
Thats it for now
Stew
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