implmex
Diamond
- Joined
- Jun 23, 2002
- Location
- Vancouver BC Canada
Good afternoon All:
So my new to me Jones and Shipman is proving to be a disappointment; I have lots of small problems to fix.
I also have a really big problem to fix and I need the advice of other experienced eyes.
I can't grind a decent surface for shit.
Attached are two photos.
This is with a balanced wheel freshly dressed taking 0.0001" DOC and 0.100 WOC.
If you look at the surface of the mag chuck (ignore where the previous owner burned the shit out of it on the sinker EDM) you can see waves...the wheel is bouncing.
The first photo is right after the grind, the second is after stoning the surface to bring out the contrast.
If I take a bigger cut, say 0.0005" it's much better but still nothing to write home about and I get steps in the surface as if the wheel is dropping deeper on one side of the stroke than on the other.
The steps are maybe 0.0001" deep but they're definitely there.
I've tried everything I can think of:
The hubs blue onto the spindle taper properly
The wheel is tight on the hub and is dressed all over and balanced.
The hub is tight on the spindle taper.
I've got about 0.0003" of runout on the taper when I clock it, but it runs free and doesn't hump or grind.
I put a glass of liquid on the wheelhead while it's running and can't detect any vibration.
I think the spindle bearings are shot...what say ye all?
Cheers
Marcus
Implant Mechanix • Design & Innovation > HOME
Vancouver Wire EDM -- Wire EDM Machining
So my new to me Jones and Shipman is proving to be a disappointment; I have lots of small problems to fix.
I also have a really big problem to fix and I need the advice of other experienced eyes.
I can't grind a decent surface for shit.
Attached are two photos.
This is with a balanced wheel freshly dressed taking 0.0001" DOC and 0.100 WOC.
If you look at the surface of the mag chuck (ignore where the previous owner burned the shit out of it on the sinker EDM) you can see waves...the wheel is bouncing.
The first photo is right after the grind, the second is after stoning the surface to bring out the contrast.
If I take a bigger cut, say 0.0005" it's much better but still nothing to write home about and I get steps in the surface as if the wheel is dropping deeper on one side of the stroke than on the other.
The steps are maybe 0.0001" deep but they're definitely there.
I've tried everything I can think of:
The hubs blue onto the spindle taper properly
The wheel is tight on the hub and is dressed all over and balanced.
The hub is tight on the spindle taper.
I've got about 0.0003" of runout on the taper when I clock it, but it runs free and doesn't hump or grind.
I put a glass of liquid on the wheelhead while it's running and can't detect any vibration.
I think the spindle bearings are shot...what say ye all?
Cheers
Marcus
Implant Mechanix • Design & Innovation > HOME
Vancouver Wire EDM -- Wire EDM Machining