Pumpkin galling ? vs PMA?

[robinzon]

I guess I had too much free time on my hands today and I decided to go through my neck turning tools... I whipped out the K&M played with it a bit and adjusted the cutter, it cut ok..I am not thrilled with having a hex bolt for a depth adjuster but it works, if not a little too small for my hand... I then decided to finally whip out the pumpkin .30 and try it... what I find is that the cutter is leaving odd marks on the brass, vs say PMA (which I love) which leaves a more cleaner cut. The brass thickness seems to be fairly consistent between the two but these odd symmetric marks in either direction from the pumpkin are odd. I am attaching a picture the pumpkin is on the left (looking at the photo straight its on the left hand side) and PMA on right.

You can see the 3 rings on the Pumpkin brass. Does anyone have experience with the pumpkin to explain that?!? Makes me wonder.

 

[Fred B.]

I have used pumpkin many times, never had that issue and always looked cleaner than your PMA turned brass.

 

[Terry]

Rate of feed.

 

[Fred B.]

Did you have that on more than 1 case?

 

[robinzon]

Rate of feed.

explain ?

 

[robinzon]

Did you have that on more than 1 case?

yes I did two same thing

 

[Uncle Ed]

Question?

Did you wet tumble the cases in the photo?

I'm wondering if peened brass flakes got stuck under the cutter.

 

[robinzon]

Question?

Did you wet tumble the cases in the photo?

I'm wondering if peened brass flakes got stuck under the cutter.

nope new cases. I got the pumpkin from another member on here I mean I didn’t check the cutter very closely but looks ok to me

 

[Walt Krafft]

Things I would check, mandrel fit, lube, speed, feed- how fast did you move it across the neck.

 

[robinzon]

Things I would check, mandrel fit, lube, speed, feed- how fast did you move it across the neck.

So initially I expanded with K&M mandrel, things I have changed:

1. Expanded with Pumpkin Mandrel
2. decreased feed rate
3. cleaned the cutter.

Seems to be quite a bit better, thanks for the tips.... I am using my Dremel Driver with PMA holder, I am thinking of going to Black Widow motor (they make the TRIM IT II) or something of the sort that is stationary. I still have not found the holder for the cases I am in love with. All seem to be off center. I have 21st Century (likely best), K&M and PMA holders.

 

[Webster]

I have used pumpkin many times, never had that issue and always looked cleaner than your PMA turned brass.

Don’t know if it makes any difference. It’s been 2 years since I turned a case. After I cut to the shoulder I move the cutter back and forth on the neck doing a skim cut. It looks good. I think it still cuts a little each pass. I have to use the. K&M expander to get good fit on the cutter mandrel. Getting the case neck round with an expander before cutting seems to make sense. I use plenty of lube on the mandrel.

 

[ridgeway]

Check the cutter. Carbide? Maybe not ground properly or a chip in it?