Anyone know how to dial in the micrometer on the WIlson case trimmer unit so its accurate??? Kinda giving me fits. Its like I have to have a donor piece of brass to get the cut at the right length!!!

Thanks in advnace.

Most folks just record the setting on micrometer heads for a specific trim length, seating depth, etc. The idea is it gives you a number you can return to, and be confident in getting the same length you had before. How closely the number itself matches a specific measurement is not important.

Andy

quote:

Originally posted by BISCUT:
Anyone know how to dial in the micrometer on the WIlson case trimmer unit so its accurate??? Kinda giving me fits. Its like I have to have a donor piece of brass to get the cut at the right length!!!

Thanks in advnace.

You can take caliper measure from cutter blade to stop or use donor case. I do to many different case to record setting and calipers are prety accurate.

I too load for to many calibers to be recording. 3 younbg kids keep me luckyy to get time loading and behind the trigger.

I'll give the calipers a shot. Sounds like it would work well.

BISCUT
Try this method. Select a long case. Measure with calipers. Place in the trimmer. Carefully turn in the micrometer stem until it makes light contact with the cutter. You have to hold the cutter fully in for this to work.Do not let it move out!
Now subtract the desired trimmed case length from the long case you just set the micrometer with. Dial the micrometer stem/stop in the subtracted amount. Lock the thimble. The trimmer should now be set to trim to the length you want.
Example A 223 case measures 1.762". You want to trim to 1/750". That is .012" difference.
You set the micrometer stem to the 1.762" case. Then turn in the micrometer stem an additional .012". Lock the thimble. This will produce trimmed case lengths of 1.750".
The consistency of the trimming is dependant upon your technique being consistent. It doesn't take too much variation in pressure pushing on the cutter to allow +/-.001" or more difference in case length.
But now a bigger question. Is +/- .001" difference in case length make any notable difference on target. Unless you are involved in benchrest competition I think not.
That is not to say you shouldn't pay attention to case lengths. But I would not get too wrapped up about getting case lengths exact.
Just my thoughts.

muck

Thanks for the help.

Biscut,
Just place a case in the trimmer and trim until it stops cutting.Measure that piece of brass,and replace it in the trimmer.Loosen the micrometer adjustment screw on the trimmer and set it to the length you just measured. It is now zeroed.Tighten the screw and then set for whatever length you desire to trim.
Kind of like zeroing a balance beam on a powder scale.
rob