[How do I?] Depth micrometers with thinner rod? Action face to bolt lug measurements

jareese

jareese

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
Dec 28, 2022
Messages
253
I have a Fowler 0-6" depth micrometer where the rod diameters are 0.1769+/- at the measurement face.
I'm trying to measure to the lug face, from the action face, on an action that has a narrower diameter than that. (0.13-0.14+/-) What are some of you using with for a depth micrometer that has a thinner/narrower rod diameter?

Thanks.

*Edited for clarity
 
Last edited:
I just use the standard size rod - it really doesn't have to hit with the whole diameter. Having a smaller rod doesn't make it feel any better (I do have a smaller diameter depth mic, but it's an inexpensive digital that eats batteries with alacrity so I never use it).

GsT
 
That’s why I’m asking - it’s not reaching the lug face due to being too wide.
 
Some depth micrometers use a blade about .060 X .200 that help you reach tight spots.
 
My offshore depth mic I bought 20 years ago was unbranded, but had this feature. Starrett has one, follow this link:

449AZ-6R Micrometer Depth Gage with Non-Rotating Blade

The Starrett 449, 449M Series Micrometer Depth Gage with Non-Rotating Blade includes a .045" thick x 1/8" wide (1.2 x 3.2mm) blade that can be turned with the fingers and positioned at any angle relative to the base. In operation, the blade does not turn, but moves perpendicularly only...
www.starrett.com www.starrett.com
 
With the bolt inserted in the action measure from the action face to the end of the bolt nose. Remove the bolt place in padded vise measure from the end of the bolt nose to the front of the lugs add the two measurements and deduct the required clearance. Keep in mind that depending on the action, clearance is usually .005-.010 so the stacking tolerance really is inconsequential.
 
seasicksteve said:
With the bolt inserted in the action measure from the action face to the end of the bolt nose. Remove the bolt place in padded vise measure from the end of the bolt nose to the front of the lugs add the two measurements and deduct the required clearance. Keep in mind that depending on the action, clearance is usually .005-.010 so the stacking tolerance really is inconsequential.
Click to expand...
Ah - never even crossed my mind to do that, I 'assumed' it had to be done in the action as well... *Facepalm* moment.

Thanks.
 
You must log in or register to reply here.
Back
Top