Sorting out accuracy on my Mill/Lathe

Gallery, Projects and General > Project Logs

<< < (4/5) > >>

djh82uk:
I found some old blunt hss bit that I may regrind, just need to make a grinding rest as I don't trust the one that came with it (crappy 9" bench grinder)

DJH

Darren:
You are being too fussy, grind it freehand .... nothing is critical, just get it close. :thumbup:

djh82uk:
well I just tried grinding an existing tool, just sharpened it a bit and added bit of a radius to the cutting point,

Here is the piece after a light cut, the material is bright mild steel:

And after some rough sanding:

And then some wet sanding:

And the finished item after a go with a polishing wheel:

Im fairly happy with that, may try some aluminium next

DJH

djh82uk:
also just checked runout on the shiny part and I get about 1/10th of an increment on the dti, which equates to about 0.001mm, is that 0.3 thou?

I guess I should try it on a non polished piece, but just after cutting, but would'nt the little ridges affect the reading a bit?

Either way I guess I don;t have chronic runout

Thanks

DJH

sbwhart:
DJH

Thats not too bad, I wouldn't worry too much about that finish ther's a lot of factors that are out of your control that can effect finish, the material for one thing ther's lot of grades of mild steel some are s**t to machine and some are great and give a real good finish, some grades of steel are very dificult to machine, you'l learn to recognise them in time.

You want to try and keep the amount of polishing down to a minimum, try and get the best finish you can off your machine and only polish where its needed.

Have fun

Stew

Navigation

 Message Index

Go to full version