PMA Type B Neck Turner
- Thread starter Killick
- Start date
There's no reason you couldn't use it for your finish cut. With the mandrel locked into a fixed position in the Model B, it's really not any different than having a Model A's mandrel locked into position. It looks like the Model B is also adjustable, it's just not going to be as easy as it is with the Model A.
If your budget leads you towards the Model B over the Model A, I would postpone the purchase until there's some extra funds in the kitty. But if your situation allows you to set it and forget it, nothing will ever change setup the Model B will work fine. After all it's still adjustable.
If your budget leads you towards the Model B over the Model A, I would postpone the purchase until there's some extra funds in the kitty. But if your situation allows you to set it and forget it, nothing will ever change setup the Model B will work fine. After all it's still adjustable.
Yes! I prefer it over the adjustable because it holds its setting better. use shims to set the cut depth
GPat
Site $$ Sponsor
I'm not sure the Model B holds it's adjustment any better than a Model A, but it is more simplified. After the adjustments are made and locked on a Model A they are essentially the same tool and should both hold their adjustment. I've noticed that brass can turn slightly differently lot to lot and the cut can vary slightly if your mandrel gets hot. If the brass is expanded properly, heat should not be a problem.
We ship the Model B preset to whatever cut thickness you request. The thickness is guaranteed within .0005" and we generally set them up to cut right on the requested thickness, and err on the thin side. Most customers report back that their Model B cut right on to .0002" under their requested thickness.
The Model B can be adjusted using feeler gauges, that's how we do it in house. It's not as simple or as accurate as using the micrometer adjustment on the Model A, but it can be done.
For guys wanting to neck turn to gain the benefits of uniform neck thickness and are not concerned with getting a specific neck diameter, we recommend the Model B. For the guy with a tight neck chamber or wanting to turn for multiple cartridges we recommend the Model A.
If you have any further questions call me at 260-246-5860
Pat
We ship the Model B preset to whatever cut thickness you request. The thickness is guaranteed within .0005" and we generally set them up to cut right on the requested thickness, and err on the thin side. Most customers report back that their Model B cut right on to .0002" under their requested thickness.
The Model B can be adjusted using feeler gauges, that's how we do it in house. It's not as simple or as accurate as using the micrometer adjustment on the Model A, but it can be done.
For guys wanting to neck turn to gain the benefits of uniform neck thickness and are not concerned with getting a specific neck diameter, we recommend the Model B. For the guy with a tight neck chamber or wanting to turn for multiple cartridges we recommend the Model A.
If you have any further questions call me at 260-246-5860
Pat
GPat said:
That explains something for me. I was turning a batch of cartridges the other day and all of the sudden the cutting depth changed. One case was .0127 and the next two were .0130. No biggie, adjusted my Model A and was back to .0127. Stopped for a few minutes and when I resumed with the next case it was .0122. What I don't understand is why the cutting depth decreased when the mandrel got heated up and increased when it cooled down. Seems backwards. Heat expands, cold contracts.
DeltaBravo
Gold $$ Contributor
Bacon,
You hit it on the head - when the mandrel expands, the brass is closer to the cutter; when it contracts it is farther away. I've got the B for my initial cut, then use the A for my follow-on cuts. I usually take 3 or 4 turns at the final cut and it seems that each time a tiny bit more is cut off; I wait about 10 seconds between cuts. I use a Mitutuyo tubing mic to measure and can see that final .0005 +/- come off to get me to my end measurement of .0105 +/- .0002 for my .266 neck and a .002 clearance in my 6BR.
Dennis
You hit it on the head - when the mandrel expands, the brass is closer to the cutter; when it contracts it is farther away. I've got the B for my initial cut, then use the A for my follow-on cuts. I usually take 3 or 4 turns at the final cut and it seems that each time a tiny bit more is cut off; I wait about 10 seconds between cuts. I use a Mitutuyo tubing mic to measure and can see that final .0005 +/- come off to get me to my end measurement of .0105 +/- .0002 for my .266 neck and a .002 clearance in my 6BR.
Dennis
A j shooter
Shoot often
You will be happy with your purchase. Good people to deal with.
Update - - PMA Type B Neck Turner
I've started using the PMA Model B neck turner on my 6XC from 22-250 Lapua virgin brass and I am very pleased with the results. When I first tried it I felt the pressure needed to drive the case to the cutter was excessive and it was causing the tool to heat up too quickly. This was because I was using the Tubb 6mm expander mandrel supplied with the original Tubb 6XC sizing die which did not expand the brass to the proper diameter so I purchased the PMA 6mm expander mandrel and the Sinclair expander die. That made all the difference in the world. Using the PMA case holder chuck and PMA neck turning lubricant makes the tool heat up issue extremely manageable. I've fire formed about 20 cases so far and am thrilled with the results. the nature of using the "No Mushroom" case forming protocol for 22-250 to 6XC will require me to touch up the shoulder of the fire formed cases but that was not an unexpected outcome. Only 280 more to go.
I've started using the PMA Model B neck turner on my 6XC from 22-250 Lapua virgin brass and I am very pleased with the results. When I first tried it I felt the pressure needed to drive the case to the cutter was excessive and it was causing the tool to heat up too quickly. This was because I was using the Tubb 6mm expander mandrel supplied with the original Tubb 6XC sizing die which did not expand the brass to the proper diameter so I purchased the PMA 6mm expander mandrel and the Sinclair expander die. That made all the difference in the world. Using the PMA case holder chuck and PMA neck turning lubricant makes the tool heat up issue extremely manageable. I've fire formed about 20 cases so far and am thrilled with the results. the nature of using the "No Mushroom" case forming protocol for 22-250 to 6XC will require me to touch up the shoulder of the fire formed cases but that was not an unexpected outcome. Only 280 more to go.
P1ZombieKiller
Silver $$ Contributor
IMO there isnt a better tool. I have cut over 5,000 cases over the last year and a half and my turners are still right on. I have since gone to making 3 cuts on most of my cases (only turni g .0015" per cut) and that seems to help me produce extremely accurate cases. I also find when I lock a turner down, it is solid and holds .00015" tolerences. Since I turn for multiple calibers and multiple thicknesses, I now have 4 model A's and would not hesitate to get another if I take on additional calibers.
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