Depth Gage with hook

For a hollow tube a hook scale would work. If your eyes are good you should be able to measure within a 64th or better with no problem.

How close do you want to measure it?

John

As close as sanity provides. Within a thou.

If you want cheap make up a hook scale without numbers and then depth mike off the opposite end of it. Measure the length of the hook scale and do the math. Or if you can put a straight edge across the back end just use a depth mike.

John

If I can assume you know the length before you start turning it it should be simple. You need to know what you removed. The micrometer stop is good for that. dychem your workpiece so you can see when you first start cutting. Use the stop for the rest.

I'm thinking the other way, know what you have and measure what you take off.

Wes

-- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller

Also turning your compound parallel, carriage locked, feed to take off the dykem and then use your dial or dro.

Wes

-- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller

I have used a depth mic rod with a disk like flanged end [.025 wide ] that does that for over 40 years. With it you can measure location and width of o'ring grooves deep down bores and the like. You have to zero it every time and use a double nut to lock rod in place. For longer then 1 inch you have to use a jo block to set. And subtract the ,025 going one direction.

Jim

PS One rod works in a standard depth mic for up to 6 inches.