Grinding tip of spindle on micrometer to get better reading

[bunny too]

Howdy,
I have a Mitutoyo 115-313, 0 - 1" X .0001" micrometer and I was thinking about grinding the spindle sides at the tip to reduce the surface area to get better measurements next to the shoulder. Have any of you done this? I have to take a look but I think I can do it without taking it apart if I am careful. I would like the tip to be a truncated cone, I would not be removing anything from the measuring surface of the tip. Any thoughts?

 

[1moaoff]

The first thing that comes to mind is why? And no I have never done what you are proposing. Typically when your are talking 4 decimals and need greater change tools... if its because of geometry sometimes tips are available

 

[Molon]

I have a Mitutoyo 115-313, 0 - 1" X .0001" micrometer and I was thinking about grinding the spindle sides at the tip to reduce the surface area . . .

My favorite way of measuring the case neck thickness of 223 Remington cases.

.....

 

[2aBaC̶a̶]

^^^ get the right tool for the job.

Ball micrometer.

Or go buy a $20 harbor freight caliper and ruin that.

 

[FishDr]

+++^^^^ What he said.
Please don't ruin a good tool because you need a different tool. You need a spline attachment.

Mitutoyo Micrometer Standard 48" 167-412

Mitutoyo Micrometer Standard 48" 167-412

www.microscopeworld.com

 

[spife7980]

There is a company that alters them to be like that with the bevel to accommodate the shoulder angle to get up close, cant remember the name.

If you do it well I dont see why it wouldnt work.

 

[FishDr]

Agreed, it would likely work well... but for $30 you can get an off-brand of above, and it is reversible if you don't like it. Just a thought. I always hate grinding on my expensive tools, but sometimes there is just no other way.

 

[bunny too]

My favorite way of measuring the case neck thickness of 223 Remington cases.


View attachment 7541307



View attachment 7541308



.....

Did you buy it that way or modify it?
Thank you,
David

 

[JBoomhauer]

Might be worth a try.

Mitutoyo 101469 Micrometer Ball Attachment Tip, 0.250" Diam.: Amazon.com: Industrial & Scientific

Mitutoyo 101469 Micrometer Ball Attachment Tip, 0.250" Diam.: Amazon.com: Industrial & Scientific

www.amazon.com

 

[2aBaC̶a̶]

Actually sounds like he needs a blade micrometer for precisely measuring the OD of the case next to the shoulder.

Not that its that critical. But to each his own.

 

[bunny too]

Ok, I found the exact same micrometer that I own just with the beveled tip for seventy more dollars. It is made by K-M Precision and I believe it is the model in the pictures above. Thank you for all your suggestions and help.
Regards,
-d

 

[Molon]

Ok, I found the exact same micrometer that I own just with the beveled tip for seventy more dollars. It is made by K-M Precision and I believe it is the model in the pictures above.

Correct.