Centerless Grinding - Part Slip on Regulating Wheel
Centerless Grinding - Part Slip on Regulating Wheel
(OP)
We are centerless grinding a steel shaft using water soluble coolant at 4%.
We are seeing part slip on the regulating wheel. It appears to be the worst immediately after dressing.
The jobsetter thinks that the regulating wheel is loading and causing the problem.
Any suggestions or comments?
We are seeing part slip on the regulating wheel. It appears to be the worst immediately after dressing.
The jobsetter thinks that the regulating wheel is loading and causing the problem.
Any suggestions or comments?





RE: Centerless Grinding - Part Slip on Regulating Wheel
I am a fluids guy so look at the coolant:
1-is the concentration right?
2- tramp oil can cause wheel loading and wheel slippage?
3- if it is a soluble oil and the emulsion is splitting - increasing particle size this can cause wheel slip?
4- over use of anti foam can cause wheel loading as well?
A.R. "Andy" Nelson
Engineering Consultant
anelson@arnengineering.com
RE: Centerless Grinding - Part Slip on Regulating Wheel
Is it still the same as it was before the problem started?
It might be one just as good as but not suitable for grinding.
Has the manufacturer changed the formulation of the bulk coolant as very minor changes can and will cause problems under the right conditions?
Make sure the shop hasn't combined two into one, like 49a with 49b because they look and smell alike.
If your are able check the bacteria level in the sump.
Is the steel the same one used to setup the process?
RE: Centerless Grinding - Part Slip on Regulating Wheel
RE: Centerless Grinding - Part Slip on Regulating Wheel
Another possiblity is that the parts aren't straight when they go into the grinder.
Tramp oil (as mentioned by saberblue) is another likely culprit.
If the reg wheel speed is too high or the part is too high above center the part will slip. This always causes part rattle.
Last (and probably least)is the chance that the reg wheel is dressed at too fast a rate. The dress should normally be no > than 3 inches/minute when running long bar stock.
RE: Centerless Grinding - Part Slip on Regulating Wheel
By changing the concentration of a soluble oil by 5% you can change wheel hardness by a grade to a grade and 1/2.
A.R. "Andy" Nelson
Engineering Consultant
anelson@arnengineering.com
RE: Centerless Grinding - Part Slip on Regulating Wheel