Marking the center on a tappered blade?

Joss

Joss

Joined
Nov 20, 2001
Messages
7,353
All,

Does anyone have a trick to mark the center of the blade (in the thickness) on a tappered blade?

Thanks,

JD
 
This may not help in your situation, but if you mark the center on flat stock and then grind a perfect taper the center line remains centered. Does that make sense?
 
If the tang, or choil area is flat, you could use a vernier height gauge. Find center there, and either scribe the gauge down the blade, or move the blade down the gauge.
Another more basic way would be to measure, and mark center in various points along the blade, and just connect the dots.
 
Hi Joss,

I believe that Uncle Al's sells a center scribe tool that will mark the centerline even on a taper. It's a piece of aluminum stock about half an inch wide and maybe 1.5 inches long with two pins sticking out of one side on each end. The scribe is in the center of the tool. You put it over your stock with one of the pins on each side and rotate it until it is captured on the stock and then scribe away. It works ok until one of the pins runs off of the end of the stock...

-Darren
 
Hi Joss!

Yep! got the answer for ya. I'll get a pic of the tool I made and post it up. In the mean time, you can make one yourself out of a chunk of 3/8" thick brass, aluminum or whatever. Cut a chunk of 3/8" material about 1- 3/4" to 2" long. Place two dowels (1/8" works great), one on each end of a 3/8" thick side. Location is not all that important. Next measure to EXACTLY half way between those two pins. Punch mark and drill a blind hole.....insert a carbide scribe point into the center hole you just drilled. (you can secure it with a set small set screw if you desire). Better yet, here is a crude drawing........maybe it will explain better than I can in words.
Centerscribetool.jpg


The text is pretty small, but my image editing software wouldn't make it any larger........I'll try to get a pic up soon.
 
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