Headspace Gage Gauge pins

[paintballmagnet]

I want to obtain a set of pins to use for headspace setting. What sizes will I need to do this? Also, where is the best place to obtain the receiver clamp and other tools for assembly? Thanks for your info!

[ September 09, 2001: Message edited by: gary.jeter ]

[bullsear]

Try Travers Tool (travers.com). They are $2 each.
According to what I have used, the sizes listed by gp of .256 to .264 are right on.
For the receiver wrench, contact Casey Elliot unless you feel like making one. (see vendor section on front page for his location)
Some people use a 1 1/16 wrench on the barrel after filing it out to fit, but I have had better luck using a milling machine vise to hold it, and spin the receiver on the barrel with the Elliot wrench. If you use a milling machine vise, be sure to use some metal scraps against the jaws to prevent marring them if the barrel tries to twist.
Some people also buy a tool to install the main spring in the stock, but I use a .22 cal cleaning rod with handle to get it started, then remove and tighten with a quarter.
You will also want to rig something to use to determine if the barrel is properly indexed. I made some rods, one fits in the bore at the STG front sight and stands vertically. The other piece was made from a chunk of aluminum that would just fit into the receiver (about 1" thick) and a rod. This block was drilled so the rod was a press fit, and you have your second vertical reference to sight down.

[gunplumber]

with an in-spec receiver, .254"-.263" or a closer range. With a Hesse or Entreprise, you may need to go as high as .275"



------------------
T. Mark "Gunplumber" Graham
gunplumber@arizonaresponsesystems.com
Arizona Response Systems
5501 North 7th Avenue, Phoenix, AZ 85013
623-873-1410 http://www.arizonaresponsesystems.com

[W.E.G.]

Available at http://www.mscdirect.com/PDF.process?pdf=2168

[Abominog]

Which is best- the plus tolerence or minus tolerence pins?

Also, do we need each .001 increment, or is it OK to go every other (.254, .256, etc)?

Thanks.

[This message has been edited by Abominog (edited January 03, 2001).]

[MickeyMouse]

I see DSA also has a recvr wrench. Which one is best?

[W.E.G.]

Originally posted by Abominog:
Which is best- the plus tolerence or minus tolerence pins?

It makes absolutely no difference. You could even mix up plus and minus pins (although there is no reason to do so). You would never be able to tell the difference. The tolerance at issue is .0002 inches!!! By the time you are trying to set headspace that precise, you are chasing your tail.

Originally posted by Abominog:
Also, do we need each .001 increment, or is it OK to go every other (.254, .256, etc)?


Every other increment is fine. The range of acceptable headspace variation is around .004 inches. So long as your gauges (or is that "gages?") control to within .002 inches you will be within spec. I think you could get by with buying every THIRD guage.

[Neira]

bullsear,

What keyword do you use for the search? At travers.com that is. I tried to find the gauges but I couldn't do it for some reason.

[TooTech]

As I understand it, the minus tolerance pins should fit through a hole of the same designation of the pin. The plus sizes are as close to the stated size as they can be made, so they would NOT fit through a hole with the same designation without the use of a hammer!.

But as someone already posted, the difference is negligible, but all things being equal I got the plus size pins as that is closer to what I'm trying to simulate.

[Bruce]

FWIW, I prefer the minus tolerance pins. I worked in a shop once that had plus tolerance pins and everyone hated them.

Say you have a hole that is EXACTLY .2500. A plus tolerance pin will not fit in it without a hammer, and you should never use a hammer on a gauge.

A minus tolerance ".250" pin, will be .2498/.2499

One to two tenths of a thousandths clearance will give a "slip" fit between gauge and hole. If the pin just slides in with no force, the hole is as close to .2500 as you're going to measure.

[GregoryJ15]

Gary's cite and comments are right on MSC Provided me with a set that spans .252 - .272 each other pin .002 for $18. Use the Plus bias.

[bullsear]

Neira,

I did not order over the net, just gave that address as a reference. I have one of their catalogs that had all the info in it.

Bullsear

[W.E.G.]

btt

[Dirtfarmer]

btt
Goodwill,
-Dirtfarmer

[FALPhil]

Here's another thread with the part numbers:
http://www.l1a1.com/cgi-bin/forums/ultimatebb.cgi?ubb=get_topic&f=3&t=001230

Originally posted by gary.jeter:
<STRONG>Available at http://www.mscdirect.com/PDF.process?pdf=2168 </STRONG>