1918 aluminum inserts

[roscoe]

having a hard time locating some 1918 al inserts.  these are going to go on the old farboglass G arrows.  1916 inserts fit inside diameter but the shoulder too small to cover.  am i heading in the right direction?  any suggestions?

[hvyhitter]

The outside diameter of the 1918s shoulder should be the same, 19/64s. For more of a lip/shoulder you might try a 2018 or 2020, its 20/64 or 5/16.

[JimB]

As hvyhitter said,the first two digits in the aluminum shaft number is the outside diameter in 64th's of an inch.The last two digits are the inside diameter in 1/100 ths of an inch.

You are going the wrong direction.If you want the shoulder to match,you need 22 diameter,ie.22/64 or 11/32.You could modify some 2219 inserts to work.2219 would have the right shoulder diam but the body would be too fat.

1.Screw a field point into the insert.
2.Chuck the field point into a drill press.
3.Turn the drill press on and use a mill file to reduce the body of the insert about 5/100" total diam.
4.If you have a short piece of cut off shaft,you can occasionally stop the drill and easily check progress.

You won't find an aluminum insert to fit your shafts exactly.If you don't mind spending 1/2 to an hour of your time,you can modify these to fit exactly.2219 would be the closest with the least material to remove.

[jarhead_hunter]

I believe the 1918 shaft is 19/64 inches overall outside diameter, 0.297 inches.

The second pair of numbers (18) is the thickness of the shaft wall on one side, in 1/1000 th's of an inch, or 0.018 inches,

Since there are 2 sides to the shaft the total wall thickness is 2x0.018 or 0.036 inches.

Subtract 0.036 from 0.297 and you have a insert diameter of 0.261 inches.

Charles.

[roscoe]

thanx for the quick response guys, can always count on the tradders for help. you know, an arrow is an arrow, but these farbonglass babies have a special meaning.  on a recent trip back to the home state of iowa,  my uncle had these arrows, a homemade hickory longbow and a ben pearson 48# hunter, still hanging in the floor joices of the basement.  after serious haggling and the promise that i kill a deer with these items, they were bought for $25.00, then he took my wife and i out to lunch.  he drove a hard bargain eh? must have known something was up, he died three months later. i aim to uphold my end of the deal. thanx for keeping the promise alive