Lyman Flash Hole Uniformer Tool question

deepcore · June 16, 2011, 01:42 AM

I bought the Lyman Flash Hole Uniforming tool and have a question about adjusting it.

Instructions say: "...set your cutting length, slide the cone shaped adapter into the entrance of the case mouth. Leave a gap of .010" between the case mouth and cone shaped adapter. Tighten the adapter set screw. Your tool is now adjusted to deburee your cases"

How do I measure the .010" gap between the case mouth and the cone shaped adapter.

Want to deburr and want to make sure I don't enlarge the flash hole by mistake.

Cruz5350 · June 16, 2011, 07:38 AM

Just take a peek in there an make small adjustments. Use a light to see better.

Tuzo · June 16, 2011, 09:43 AM

Set the cone to touch the case mouth and measure the distance (with caliper) between the cone top and handle ferrule. Subtract 0.010" and adjust the cone to the shorter distance.

deepcore · June 16, 2011, 12:41 PM

Thanks!
Stupid question: is it possible to over deburr ( if there's such a thing)?
And if yes what happens?
Though the tool looks like a drill I think you'd really have to work at it to accidentally enlarge the flash hole. But I could be wrong about this too.

jaguarxk120 · June 16, 2011, 01:13 PM

The tool is actually a machinists center drill made with a long shank. The size is a #2 and the drill tip is about .080 inch. The 60 degree angle on the flutes removes any burrs on the flash hole. When using it all it takes is just a turn or two to remove any metal that causes a burr. That metal is left behind during the punching of the flash hole operation.

Note some cases have a drilled flash hole and donot need deburring. You also pay a lot more for the cases.

June 16, 2011, 01:42 AM	#1
deepcore Senior Member Join Date: July 24, 2010 Posts: 364	Lyman Flash Hole Uniformer Tool question I bought the Lyman Flash Hole Uniforming tool and have a question about adjusting it. Instructions say: "...set your cutting length, slide the cone shaped adapter into the entrance of the case mouth. Leave a gap of .010" between the case mouth and cone shaped adapter. Tighten the adapter set screw. Your tool is now adjusted to deburee your cases" How do I measure the .010" gap between the case mouth and the cone shaped adapter. Want to deburr and want to make sure I don't enlarge the flash hole by mistake.

June 16, 2011, 07:38 AM	#2
Cruz5350 Member Join Date: October 28, 2010 Posts: 63	Just take a peek in there an make small adjustments. Use a light to see better.

June 16, 2011, 09:43 AM	#3
Tuzo Senior Member Join Date: June 14, 2007 Location: Louisiana Posts: 797	Set the cone to touch the case mouth and measure the distance (with caliper) between the cone top and handle ferrule. Subtract 0.010" and adjust the cone to the shorter distance.

June 16, 2011, 12:41 PM	#4
deepcore Senior Member Join Date: July 24, 2010 Posts: 364	Thanks! Stupid question: is it possible to over deburr ( if there's such a thing)? And if yes what happens? Though the tool looks like a drill I think you'd really have to work at it to accidentally enlarge the flash hole. But I could be wrong about this too.

June 16, 2011, 01:13 PM	#5
jaguarxk120 Senior Member Join Date: February 28, 2008 Location: Michigan Posts: 2,620	The tool is actually a machinists center drill made with a long shank. The size is a #2 and the drill tip is about .080 inch. The 60 degree angle on the flutes removes any burrs on the flash hole. When using it all it takes is just a turn or two to remove any metal that causes a burr. That metal is left behind during the punching of the flash hole operation. Note some cases have a drilled flash hole and donot need deburring. You also pay a lot more for the cases.