Checking runout

[hoz53]

For you guys that like to play with your measuring tools and experiment, here is one that is easy and may show you something worth pondering. Some time when you are Fl sizing a bunch of cases with a FL bushing die, measure the runout of several cases at the case mouth, then pull the bushing out of the die and size a couple more and measure them the same way. Then you can put the bushing back in the die and run them back through to size the necks. Let me know what you discover. After that you can load the cases and record the on bullet runout. The next step will require the addition of a Lee Collet die. First size all of the necks with the Lee die (If you need more neck tension you can sand down the mandrel or order a smaller one from Lee for a reasonable price.) Then pull the bushing from your FL die and and use it like a body die set to bump the shoulder the same amount that you usually do. Load the cases and measure the runout on the bullets at the same point that you did before. Tell me what you get and if the runout is different from that of the previous batch.

the thing i dont like about the sinclair is the indicator i have puts enough force down on the case/bullet thats its hard to hold the end near the base down spin the case at the same time and get a consistent reading. i must be doing something wrong. mabie i need a different indicator. it just seems if i had something to gently hold the case base down against the bearings it would be more consistent????
mabie i need a better technique?

 

[6MMsteve]

I built my own using hardened OD ground rod and a mitutoyo dial that reads .002 mm I just convert the mm to thou, but the ball bearing sounds much better, but I have seen a great decrease in runout simply using collet dies, for me this is a plus .0005 to .0012 I'm very happy with my little slab of steel. Wish I had a mil, surface grinder,and a Lathe I could tear up some tooling

 

[6MMsteve]

For you guys that like to play with your measuring tools and experiment, here is one that is easy and may show you something worth pondering. Some time when you are Fl sizing a bunch of cases with a FL bushing die, measure the runout of several cases at the case mouth, then pull the bushing out of the die and size a couple more and measure them the same way. Then you can put the bushing back in the die and run them back through to size the necks. Let me know what you discover. After that you can load the cases and record the on bullet runout. The next step will require the addition of a Lee Collet die. First size all of the necks with the Lee die (If you need more neck tension you can sand down the mandrel or order a smaller one from Lee for a reasonable price.) Then pull the bushing from your FL die and and use it like a body die set to bump the shoulder the same amount that you usually do. Load the cases and measure the runout on the bullets at the same point that you did before. Tell me what you get and if the runout is different from that of the previous batch.

you are correct the collet die has very little if any run out I have some to read .00007 no joke

 

[Someoldguy]

you are correct the collet die has very little if any run out I have some to read .00007 no joke

Holy Moly!

What kind of indicator reads to 5 decimal places?

I need one like another hole in my head, but danged if I don't want one.

 

[BoydAllen]

the thing i dont like about the sinclair is the indicator i have puts enough force down on the case/bullet thats its hard to hold the end near the base down spin the case at the same time and get a consistent reading. i must be doing something wrong. mabie i need a different indicator. it just seems if i had something to gently hold the case base down against the bearings it would be more consistent????
mabie i need a better technique?

Two hands on the case or a long hard eraser held at a slight angle so that the case wants to stay back on the rear stop. I really prefer a dial indicator for this application.

 

[hoz53]

Two hands on the case or a long hard eraser held at a slight angle so that the case wants to stay back on the rear stop. I really prefer a dial indicator for this application.

i am using a drop style dial indicator --i thought mabie a test style would put less force against case/bullet and be easier to use the fixture

 

[6MMsteve]

Holy Moly!

What kind of indicator reads to 5 decimal places?

I need one like another hole in my head, but danged if I don't want one.

I use a metric mitutoyo dial indicator then I use a Mitutoyo IP65 Micrometer .00005 on inch to tally the runout, just stuff I bought at a auction cheap to fit my needs I'm poor lol but I have fun .002 mm = 0.00007 inch I think lol

 

[6MMsteve]

the thing i dont like about the sinclair is the indicator i have puts enough force down on the case/bullet thats its hard to hold the end near the base down spin the case at the same time and get a consistent reading. i must be doing something wrong. mabie i need a different indicator. it just seems if i had something to gently hold the case base down against the bearings it would be more consistent????
mabie i need a better technique?

adjust the indicator back away from the case so it will put lighter pressure on or use a pc of wood bout 10 or 12 inc long put a rubber band on it and use it like playin a violin roll the case I just use my fingers and go slow

 

[Someoldguy]

I use a metric mitutoyo dial indicator then I use a Mitutoyo IP65 Micrometer .00005 on inch to tally the runout, just stuff I bought at a auction cheap to fit my needs I'm poor lol but I have fun .002 mm = 0.00007 inch I think lol

Umm . . I believe that's closer to .079".

If I'm incorrect, someone will be along directly to set me straight, no doubt.

 

[hoz53]

adjust the indicator back away from the case so it will put lighter pressure on or use a pc of wood bout 10 or 12 inc long put a rubber band on it and use it like playin a violin roll the case I just use my fingers and go slow

good idea with the violin playin thanks

 

[hoz53]

I built my own using hardened OD ground rod and a mitutoyo dial that reads .002 mm I just convert the mm to thou, but the ball bearing sounds much better, but I have seen a great decrease in runout simply using collet dies, for me this is a plus .0005 to .0012 I'm very happy with my little slab of steel. Wish I had a mil, surface grinder,and a Lathe I could tear up some tooling

with they made those collet dies in 6br

 

[Bart B.]

.002 mm = 0.00007 inch I think lol

Umm . . I believe that's closer to .079".

.002 X .03937" = .00007874"

One millimeter equals .03937 inch.

 

[Liven The Dream]

21st or Sinclair Tools work .

I have run this Drill many times to check on run out ..
I shoot Palma .308. I have a RCBS SB Die with a Carbide Floater Ball .
This Die gives case with a .001 + or - run out ...
Now I have many FL Bushing Dies. If the Bushing is not adjusted correct and you run the Press like the Indy 500 .
You can turn out Brass with a .012 = run out .

 

[6MMsteve]

lol you guys r crazy I have this one in the lab at work