Reamer pilot selection

C

crappie

Guest
Im wondering what method you use to select a reamper pilot? I read on someones site that they select the largest pilot that will fit the bore then use a pilot .0002 smaller, im wondering why? Ease of movment in the bore or for variation in the bore?
 
crappie said:
Im wondering what method you use to select a reamper pilot? I read on someones site that they select the largest pilot that will fit the bore then use a pilot .0002 smaller, im wondering why? Ease of movment in the bore or for variation in the bore?
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I use the largest pilot that moves freely with little resistance in the bore. IMO you don't want the pilot to be dragging while the reamer advances.
 
You probably read that on the barreling article on my web site. I go down a size on the bushing when the next size bushing up feels too tight. I don't want the bushing to scar the barrel. The easiest way to check for fit is to have a small rod a few inches long and smaller in diameter than the outside diameter of the bushing that will accept the bushing with a screw on the end of it to keep the bushing from coming off the rod. It makes it easy to check for pilot fit down the bore for the length of the chamber instead of just the start of the chamber.
 
Mike Bryant said:
You probably read that on the barreling article on my web site. I go down a size on the bushing when the next size bushing up feels too tight. I don't want the bushing to scar the barrel. The easiest way to check for fit is to have a small rod a few inches long and smaller in diameter than the outside diameter of the bushing that will accept the bushing with a screw on the end of it to keep the bushing from coming off the rod. It makes it easy to check for pilot fit down the bore for the length of the chamber instead of just the start of the chamber.
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Yup. My 13" long Grizzly rod works great for that.

Fitch
 
If you think about it, having a really close- fitting bushing... assuming you're indicating the throat area and preboring... and if the barrel isn't almost perfectly straight.. can actually run the chamber OFF axis as the bushing picks up the bore before the finish depth and continues out ahead of the indicated area as you finish. I've had this happen.

If the indicating and preboring is done right, you can actually finish the chamber dead on, either with no bushing or with a rather loose (-.001) one. I've done several chambers with no bushing and it's worked really well. You just have to get the indicated throat area and the prebored area on the money.
 
frwillia said:
Yup. My 13" long Grizzly rod works great for that.

Fitch
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I have the Gritters video and know of what you speak. I have also searched the Grizzly site and catalog and can find none. If you could post the part number I, and possibly others, would appreciate it. If these are custom made, I'd better get to it!
 
http://www.pacifictoolandgauge.com/products/gaugesnbushings/indicatorrods.htm#grizzly
 
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