Part 8 grinding the magnetic chuck and the back rail on the Brown and Sharpe Surface Grinder
HTML-код
- Опубликовано: 5 сен 2024
- In the final video of the Brown and Sharp no 2 surface grinder preservation series I grind in the magnetic chuck and back rail.
I’m happy with the results for my first time doing this. Surface finish on the test part was good. With more practice I’m confident this machine can grind to tenths!
Commissions Earned on Affiliate Link
Grinding Wheel : amzn.to/3rMRESO
I'm officially hooked on your channel and I'm going to go back and watch this series. Couple tips for surface finish is to always check the spindle nut alomg with the spanner nut before starting the spindle and once dressed leave the spindle running. Thanks again and keep the vids coming.
Awesome, thank you! Great tip on the spindle nut! My first time doing all of this stuff so I take all the feedback I can get!
One touch off tip i heard was to put a lolly pop stick on the mag chuck and touch off on that. Being pretty consistent on thickness it gives a good guide to how far above the chuck you are and if you crash into the stick no harm can be done. Probably not of great use once you are an old hand at grinding but who hasn't crashed into work at some point?😭😭
That’s a good tip, I’ve heard similar ideas, for instance with a sheet of paper, which is about 0.003 of an inch thick. As always, thanks for watching the channel and providing your comments!
For better surface finish ,
Check the run out of the spindle, by placing dial on its nose , rotating the spindle manually.(should be within 5 microns).
Then check in the same way by running the spindle. Arrest the vibration caused by motor , driving belt , updown sliding clearance.
Dress the new wheel and balance it.
Thank you for the suggestions, I had not considered the vertical sliding clearance, I'll check that out. I'm considering placing the surface grinder on some rubber hockey pucks to help with vibration, what do you think of that idea?
@@EnoRestoration
Normally the driving belt and unbalanced wheel would be the cause for the vibration.
No need of rubber pad for the base. Proper leveling with spirit level is enough. Height adjustable rubber mount will be the best.
Running accuracy of the spindle counts in surface finish. Being very old machine , it should have bronze bush bearing normally.(may have retrofitted with angular contact bearings).
As we don't use updown movement continuously and frequently unlike other 2 axis , wear of the slides will be negligible.
@@user-rl8yd4hb3r for checking the runout of the spindle, what do you mean by "placing dial on its nose"? you mean place the dial indicator tip on the nose of the spindle?
Your finish tells me you have a balance issue somewhere. Looking at the belt flopping around I think that's your issue. Also I think I show touching off on a grinder on my channel. Look between the wheel and the part. Thst will get you within 0.002 with some practice. I can get inside 0.0005 with a good light and white back ground. When the light turns kinda blue ish you know you are almost touching.
Good ideas, I’ll use the touch off idea on my next SG project: a KO Lee hydraulic.