Author Topic: Accurate small diameter bore measument  (Read 588 times)

jpigg55

Accurate small diameter bore measument
« on: January 27, 2021, 01:16:00 PM »
Are there any methods to accurately measuring a small bore diameter other than plug gauges ?
SB 9A, Clausing 8520, Sanford MG 612

chips and more

Re: Accurate small diameter bore measument
« Reply #1 on: January 27, 2021, 01:18:41 PM »
What diameter?

chips and more

Re: Accurate small diameter bore measument
« Reply #2 on: January 27, 2021, 01:30:49 PM »
How about a conical taper cone hole gauge (not sure of proper nomenclature?). The watch/clock maker style (much higher grade!). The only problem is the hole cannot have any chamfer or your readings can be in error.

jpigg55

Re: Accurate small diameter bore measument
« Reply #3 on: January 27, 2021, 02:43:09 PM »
Kind of a general question, but will apply for measuring the chamber for an air rifle concept I have.
Will need to measure the bore diameter for sub 0.35" diameter holes.
SB 9A, Clausing 8520, Sanford MG 612

chips and more

Re: Accurate small diameter bore measument
« Reply #4 on: January 27, 2021, 02:46:26 PM »
Small hole gauge. Some people could call it a ball gauge.

Carpenter84

Re: Accurate small diameter bore measument
« Reply #5 on: January 27, 2021, 02:47:32 PM »
Cheapo gage pin set?

Small bore gage (ball kind), in addition to gage pins?
Shawn

First 9x42 column mill, 9x42 Induma Knee mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
D. McKenzie 15" metal shaper,
Airco dip/stick 160 welder,