Kozo's Centerfinder available here

[DavidT]

Click on the link below to get Kozo's centerfinder from his 'Shay' book. Set your printer to 'fit to page' before printing. Slow downloading due to file size. www.sergeantlewis.com/train/centertest.htm

[Jamie Harris]

Thanks for posting that link, I have been looking for that article for a while now.

Jamie

[IronMan]

Greetings all,

I will be trying out within the next little while 2 different types of center finders. One is from a recent Model Engineer issue, quite easy to make it uses O rings instead of a ball, or a piece of rubber. The one idea, that so far I have not heard of is using a Lazer beam, should be quite feasable, Good ?? I dont know, I will however give a follow up on it. Unless someone is faster or already has made the experiment .

If I just had a bit more time..........

Regards,
From Montreal.

[Jamie Harris]

What I have been doing is using a 1/4" rod that has a centerdrilled hole in one end and a 60 degree point on the other end, about 8 inches long.

Then I centerpunch where the exact center of the workpiece is, chuck it in the 4 jaw where I think it is close to on-center, put the pointed end of the rod in the centerpunched dimple, and put the other end on the live center of the tailstock. Then I set up an indicator as close to the workpiece as possible running on the top of the rod. It will move up and down as you turn the headstock (turn it slowly by hand, not under power). This seems to give me relatively good accuracy.

The only reason why I worry about using Kozo's device is because you can't put an indicator on it. Anybody care to comment?

Thanks,
Jamie

[Bill Holland]

well the human eye can see movement as little as .003 right?
THe leverage of Kozo's center finder is 10 to 1. so IT amplifies any movement on the 4 jaw chuck to the tail stock end. So if you cant see the end of the wobbler moving, you can be sure that the workpiece is centered better than .001 in the chuck.
Thats how I Read it in my building the shay book, and it seams pretty logical. I have yet to make his wiggler, but I will soon.
Now for the life of me, I have a hard time centering stuff in a 4 jaw using a DTI. Just takes practice I bet.