SINCLAIR NECK TURNER

[antelopedundee]

Last night while foraging through my little visited junk cabinet I happened upon a new Sinclair neck turning tool that I'd bought 20+ years ago and forgot that I had it. Since Brownells doesn't offer replacement parts and I really don't need another 17.5 degree cutter, how hard would it be to re-cut it to 40 degrees to work with Ackley Improved cases?

Also the set screw to hold the mandrel in place is larger than the 10-32 screw used on the current NT-1000 model. Anyone know what size that might be? Same for the screw that moves the cutter; if there was one I can't find it.The threaded hole for it looks to be something on the order of 5/16.

 

[TAJ45]

Use your calipers to get screw size. Look at the fine thread equivalents such as 1/4 28, 5/16 24 if indeed "next size up.
Divide 1 by thread per inch(pitch) then x .866. This gives thread depth.
If 1/4 - 28 tpi is your suspicion,
1 divided by 28 = .0357
Multiply by 2 (each side represented)
.0714 added to your measurement w calipers should get you close to the nominal size of 1/4.

Depending on caliper jaws, your skill and thread crest flat, you may be (SWAG!!) .010 over nominal, in this case, 1/4.......so abt .260.
ANYthing around .250 will mean a quarter inch screw.

 

[antelopedundee]

Use your calipers to get screw size. Look at the fine thread equivalents such as 1/4 28, 5/16 24 if indeed

Or go to Lowes or the local machine shop supply house and they will do it. Easier to ask on the off chance that someone else knows.

If I end up using it I'd replace the set screw with a long Phillips or torx screw since I can usually get them to snug up better. I thought I had one set up earlier only to have the dang mandrel come loose when I was about 90% done.

 

[TAJ45]

Sry for incomplete post. Hit wrong button when checking op sequence.

 

[Leeman]

I re-ground the angle on my Sinclair neck turner very easily to suit the 6.5x55 ackley case, can't remember now what I used but it cut very easily. Must have been getting on for 15 years ago and still using the same cutter today.