zx9
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Thread resurrection. I had put the lack of a taper in my spindle to the back of my mind until the Christmas / New Year break when my mind started to drift to un completed projects and prompted by a make your own spindle thread on the Yahoo Drummond group I started to kick ideas around. Long story short someone from the other side of the pond had done similar by installing a 'soft taper socket' in his spindle.
Soft taper sockets cold not be found over here but Arc Euro Trading do MT taper socket sleeves https://www.arceurotrade.co.uk/Cata...aper-Straight-Sockets---For-Tang-Type-Tooling in either .750" or 1" sizes intended for holding MT tooling in a 3 or 4 jaw chuck. As I had measured the bore of my spindle to .750" that is the one I bought, along with some loctite type stuff.
The overall length of the sleeve needed reducing to just under an inch and a half which I did with a insert parting off tool which took a while as it is a hardened sleeve. The insert is now very second hand, the little bits of wrecked carbide do make a pretty orange spark as they depart this world.
Parted off quite cleanly.
The end surfaced and edges broken, it actually surfaced far easier than it parted off giving nice short curly chips.
I cleaned up the spindle and sleeve with brake cleaner and assembled, it was a tight sliding fit needing to be eased on it's way with a hide hammer.
Almost finished this was yesterday afternoon, today I put a clock on it and it was way out.
No problem, set up the top slide by tracking the taper of a centre held on the tail stock chuck and fit my smallest boring bar and away we go.
After re cutting the taper I took a fraction off the front of the sleeve to make it flush with the spindle nose.
Next a 1MT reamer to clean it up and out with the dial gauge again, I have now got the run out of 0.04mm measured on the centre just before it starts to form the cone. Perhaps not perfect but as the spindle nose register has 0.02mm run out I think I will call it job done.
Soft taper sockets cold not be found over here but Arc Euro Trading do MT taper socket sleeves https://www.arceurotrade.co.uk/Cata...aper-Straight-Sockets---For-Tang-Type-Tooling in either .750" or 1" sizes intended for holding MT tooling in a 3 or 4 jaw chuck. As I had measured the bore of my spindle to .750" that is the one I bought, along with some loctite type stuff.
The overall length of the sleeve needed reducing to just under an inch and a half which I did with a insert parting off tool which took a while as it is a hardened sleeve. The insert is now very second hand, the little bits of wrecked carbide do make a pretty orange spark as they depart this world.
Parted off quite cleanly.
The end surfaced and edges broken, it actually surfaced far easier than it parted off giving nice short curly chips.
I cleaned up the spindle and sleeve with brake cleaner and assembled, it was a tight sliding fit needing to be eased on it's way with a hide hammer.
Almost finished this was yesterday afternoon, today I put a clock on it and it was way out.
No problem, set up the top slide by tracking the taper of a centre held on the tail stock chuck and fit my smallest boring bar and away we go.
After re cutting the taper I took a fraction off the front of the sleeve to make it flush with the spindle nose.
Next a 1MT reamer to clean it up and out with the dial gauge again, I have now got the run out of 0.04mm measured on the centre just before it starts to form the cone. Perhaps not perfect but as the spindle nose register has 0.02mm run out I think I will call it job done.
