Enfield-Rifles.com Homepage
Forum Home Forum Home > Enfields > Enfield Gunsmithing
  New Posts New Posts RSS Feed - Head space gauge
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Head space gauge

 Post Reply Post Reply Page  <123
Author
Message
Honkytonk View Drop Down
Senior Member
Senior Member
Avatar

Joined: December 30 2017
Location: Brandon Mb
Status: Offline
Points: 1225
Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2018 at 4:56am
I haven't talked to my machinist buddy for a while. The plant where I used to work at has had several unfortunate mechanical outages this year, so buddies workload is substantial. He has the design, but I suspect it'll be a while before I see the product.
Back to Top
Sponsored Links


Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 1162
Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2018 at 6:46am
In reading all these posts,I started thinking about one thing, bolt head size,and not the obvious #0,#1,#2,and #3 size,I mean the actual size of the bolt head between the same size numbered head,and then between the other three. The rifle I just built has a #2 bolt head,the Forester .070" Field gauge won't close on it. I measured the bolt head and it reads .0631. For s&#ts and giggles I measured all my spares. I have four #1's, two #3's,and three #2's. Three of the #1 measured .631,just like the #2 in my rifle however,one of those #1 boltheads read at .0632". Guess what I did. One of the #3's measured at .0637",and one of the #2's measured at .0636. The main thing here is that I have a rifle that passed the field gauge test with two different boltheads sizes and the shorter #1 is actually.001" longer then the #2. Use the head space gauges accordingly but take into careful consideration the actual wear on the bolt head face itself.
Back to Top
Shamu View Drop Down
Admin Group
Admin Group
Avatar
Logo Designer / Donating Member

Joined: April 25 2007
Location: MD, USA.
Status: Offline
Points: 9280
Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2018 at 7:31am
As long as they clock at less than 15° overturn that's great.
There is a guy who has done a lot of research into head number Vs bolt length & you've confirmed his results.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 1162
Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2018 at 8:11am
None of mine clock any more then 12°. I went one more step in this endeavor of mine. I have three spare No4 bolts,the shortest one measured in at 5.525" and the longest one at 5.530". I'm looking at this from a functionality perspective too,so bear with me on this. If you are building an Enfield rifle for whatever reasons and you have discovered that you have a headspace issue even after you have installed the dreaded #3 bolt head. Go back,and if you have a couple of spare bolts,or bolt heads, gauge them,make sure they're measuring out to the standard size,and if not,check if you have one that is a couple of thousands of an inch longer,maybe an unissued one. Check the fit and functionality along with the headspace. You might discover that the issue was with a very worn bolt or bolthead,or both...
Back to Top
Goosic View Drop Down
Senior Member
Senior Member
Avatar

Joined: September 12 2017
Location: Phoenix Arizona
Status: Offline
Points: 1162
Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2018 at 8:28am
Think of it like this.
Everytime,that you pull,or squeeze the trigger on that Enfield,that tiny .303 British hammer/case,beats the crud out of that bolt face,smashes that against the bolt,and then all that pressure is put onto the locking lugs. After awhile those items will get shortened in length. The face of the chamber wear comes from excessive chambering and rechambering of cartridges that wear out the area were the rim of the cartridge sits. Look at the bottom of the barrel were the bullet hits it after the feed ramp. If it's real bad, a barrel replacement will be necessary but,if it still has retained it's flat edge, check the bolt and bolt head.
Back to Top
Zed View Drop Down
Special Member
Special Member
Avatar
Donating Member

Joined: May 01 2012
Location: France
Status: Offline
Points: 2469
Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2018 at 11:49am
I replaced the bolt on my SMLE to get the headspace better. It was at the field limit. The new one has to be sufficiently long enough to be stoned to fit. It is essential that you have equal load on the lugs. 
It is a delicate operation to stone it to fit and not remove too much material; so as to retain the extra length. You've got 5 thou to play with and you may need to stone 2 or 3 of that to fit. So the actual improvement may only be 2 thou depending on how lucky you are.
It's nice to be important, but it's more important to be nice!
Back to Top
Shamu View Drop Down
Admin Group
Admin Group
Avatar
Logo Designer / Donating Member

Joined: April 25 2007
Location: MD, USA.
Status: Offline
Points: 9280
Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: March 19 2018 at 12:24pm
That's also the reason for the max 15° over-clock! Its so the forces will be transmitted to the bolt face by the shoulder on the bolt & the rear face of the head, not the threads!
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
Back to Top
Ranch Dog View Drop Down
Groupie
Groupie
Avatar

Joined: February 21 2018
Location: Texas
Status: Offline
Points: 57
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ranch Dog Quote  Post ReplyReply Direct Link To This Post Posted: March 21 2018 at 2:03pm
Originally posted by Honkytonk Honkytonk wrote:

I haven't talked to my machinist buddy for a while. The plant where I used to work at has had several unfortunate mechanical outages this year, so buddies workload is substantial. He has the design, but I suspect it'll be a while before I see the product.
A buddy of mine, Al Nelson, who owns NOE Bullet Moulds, called me today to visit. He has done a number of projects that I have suggested so he is going to look into these headspace coins.

I sent Al the dimensions of the 303 British "coins" and if anybody has the same for the other cartridges offered, please post them.
Back to Top
Canuck View Drop Down
Special Member
Special Member
Avatar
Donating Member

Joined: January 17 2012
Location: Agassiz BC
Status: Offline
Points: 2299
Post Options Post Options   Thanks (1) Thanks(1)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: March 21 2018 at 2:12pm
That's great, Ranch Dog! Please keep us posted.
Castles made of sand slip into the sea.....eventually
Back to Top
Shamu View Drop Down
Admin Group
Admin Group
Avatar
Logo Designer / Donating Member

Joined: April 25 2007
Location: MD, USA.
Status: Offline
Points: 9280
Post Options Post Options   Thanks (1) Thanks(1)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: March 22 2018 at 5:11am
The coin style for the .303 British also work for the mosin Nagant 7.62X54R round
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
Back to Top
 Post Reply Post Reply Page  <123
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.05
Copyright ©2001-2016 Web Wiz Ltd.