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Post by gunny on Sept 4, 2011 13:06:41 GMT -5
Tried using single cut mill bastard (2) of them ,and managed to knurl up .002 . How much can a person expect to knurl up ? Is there a file type or brand that works best ? Thanks gunny
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Post by artjr338wm on Sept 5, 2011 20:25:06 GMT -5
Using two Nickelson cross-cut flat bastard files I managed to get my 290 grain TMZs to knurl up to .4535, to .454" from a factory OD of .450-.451". But it took about 90 seconds of extreamly hard pressing to get them up to .454".
I did not enjoy quite so much success with my 245grn Spit Fires, but I still got them to knurl up to .4525-.4535".
I ended up knurling on a large peice of marbel I got for free, it seemed to help.
I also feel it is helpfull using the largest (widest) files you can find.
After a fair amount of trying different knurled ODs and no less than three different sabots, I did get both to shoot quite well out of my 10ML-II.
There should be a excellent explanation with compleate step by step how to instructions with pics in the "TIPS and HINTS" section IIRC.
Hope this helped,
Arthur.
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Post by gunny on Sept 6, 2011 5:41:45 GMT -5
I counted the number of teeth on the flat bastards and they were 32 per inch . I see grainger has them in different tooth counts Im wondering would a 20 tooth count be better? More aggressive cut. After your post Art i tried rolling them some more and i did get up to .004 ,with considerable effort. gunny
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Post by fishhawk on Sept 6, 2011 6:39:57 GMT -5
Fasten the file your holding to a flat piece of wood to avoid breaking the file and slitting you wrist or worse.
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Post by gunny on Sept 7, 2011 1:16:41 GMT -5
Ive got it attached to a 2x4. Anybody have any experience using a more agressive file?
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Post by pposey on Sept 8, 2011 10:10:18 GMT -5
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Post by pposey on Sept 8, 2011 10:19:44 GMT -5
I'll count some teeth this evening and let ya know
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Post by Jon on Sept 8, 2011 14:27:15 GMT -5
Just my 2 cents I'm going to predominately full form sabotless I really don't have a horse in this race. But personal I've seen some relatively inexpensive knurling machines on this board that do a great job and are very predictable. I know your out there sound off. Even at a couple of hundred they would pay for them self in a short time.
Jon
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Post by Deleted on Sept 8, 2011 19:52:24 GMT -5
Corbin has one for around 210.00 IIRC . It has a toothed drum that is pressed on a bullet that sits on rollers. I think there is a handle that turns the drum and makes the knurling on the bullet.
If that makes any sense,lol.
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Deleted Member
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Post by Deleted on Sept 8, 2011 19:54:57 GMT -5
Corbin has one for around 210.00 IIRC . It has a toothed drum that is pressed on a bullet that sits on rollers. I think there is a handle that turns the drum and makes the knurling on the bullet.
If that makes any sense,lol.
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Post by pposey on Sept 9, 2011 7:17:14 GMT -5
Depending on which time I counted,,, there are 26-28 teeth per inch on the file I am using,, that's counting on the side of the file
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Post by gunny on Sept 9, 2011 8:32:56 GMT -5
26 to 28 thats pretty close to the 32,but you said your getting good results. If i could find something in the 22 to 24 double cut? Thanks for doing the count gives me an idea what i need to work with. I guess i don,t need to get to agressive to be effective. I looked at the corbon tool just a bit pricey right now. gunny
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Post by pposey on Sept 9, 2011 10:36:57 GMT -5
I think the double cut bites in better and the little diamonds it leaves on the bullet really grip the sabot well,,, I have used a single cut mill bastard and the double cut sure works better/easier for me, It's pretty easy to get fast accurate results, I use one file and a piece of plywood for the bullet to role on. Remember the old Bullalo Bullet ML maxi bullets that had the diamond patterns on the side??? looks like them.
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Post by gunny on Sept 10, 2011 21:17:32 GMT -5
PPOSEY You were spot on, the double cut course Nicholson 12'' did the job. I rolled one tonight and pulled over .006 Now i need check what kind of loading pressure i get . I only had to go 200 miles round trip to get one  But the Wisconsin Trappers convention was going on so we killed two with this trip,worked out good. Thanks gunny P.S I rolled them on a piece of hard board, i think that made a difference in bringing out the diamond pattern |
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Post by pposey on Sept 10, 2011 21:30:52 GMT -5
Hope they shoot as well for ya as for me using that file, works with both barnes and cup and cores for me
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But the Wisconsin Trappers convention was going on so we killed two with this trip,worked out good. Thanks gunny P.S I rolled them on a piece of hard board, i think that made a difference in bringing out the diamond pattern