- Joined
- Sep 29, 2017
- Messages
- 2,251
Hi guys.
I have a toolpost grinder I've built a while back and it works great, but I wasn't completely satisfied with the finish when doing internal grinding on hardened bushing. So I decided to amp up the rpm's from 7600rpm to 13500rpm at the spindle.
To do that I had to make a bigger drive double pulley. I'm using one pulley for the external & internal grinding.
I made the pulley from aluminium and fitted a taperlock to it.
I don't have a 3/8-16unc tap needed to make the threads for the taperlock, so I made one out of EN8 (drillrod would be better, but it's not easily available around here).I know buying one would have been a lot quicker, but I wanted to see if I could make one.
I made the blank, machined the thread and relief grooves and hardened it.
Worked well enough for a selfmade tap.
I made the pulley blank and drilled and tapped the needed holes for the taperlock first and then machined the taper for the taperlock.
I then fitted the pulleyblank on an arbor I made earlier and machined the v-belt grooves.
Now I have a toolpost grinder that runs like a sun of a @#$&*. I had to add a belt tensioner because of the large pulley running to a small pulley for more grip. There is a bit of vibration I can feel and hear,but I think I can solve it by setting the preload on the bearings inside the spindle, by compressing the spring washers a bit.
I am sorry I don't have a picture of the finnish it gives now,because there was no job for it yet,but I wil post as soon as ot happens and post pics of the whole setup as well
Thanks for viewing.
Michael
I have a toolpost grinder I've built a while back and it works great, but I wasn't completely satisfied with the finish when doing internal grinding on hardened bushing. So I decided to amp up the rpm's from 7600rpm to 13500rpm at the spindle.
To do that I had to make a bigger drive double pulley. I'm using one pulley for the external & internal grinding.
I made the pulley from aluminium and fitted a taperlock to it.
I don't have a 3/8-16unc tap needed to make the threads for the taperlock, so I made one out of EN8 (drillrod would be better, but it's not easily available around here).I know buying one would have been a lot quicker, but I wanted to see if I could make one.
I made the blank, machined the thread and relief grooves and hardened it.
Worked well enough for a selfmade tap.
I made the pulley blank and drilled and tapped the needed holes for the taperlock first and then machined the taper for the taperlock.
I then fitted the pulleyblank on an arbor I made earlier and machined the v-belt grooves.
Now I have a toolpost grinder that runs like a sun of a @#$&*. I had to add a belt tensioner because of the large pulley running to a small pulley for more grip. There is a bit of vibration I can feel and hear,but I think I can solve it by setting the preload on the bearings inside the spindle, by compressing the spring washers a bit.
I am sorry I don't have a picture of the finnish it gives now,because there was no job for it yet,but I wil post as soon as ot happens and post pics of the whole setup as well
Thanks for viewing.
Michael