2020 POTD Thread Archive

No problem. Oh nice, perfect!

I forgot to mention about my magnet idea. Where I stuck it on my tool box, there's a huge recess. Maybe if I stuck it on something where the magnets have full metal contact they may hold just fine. I originally thought about sticking it to the side of my lathe cabinet. That was the main idea for the magnet mount, so I can simply move it if I decide to change my mind. I have very limited space. :(
 
I acquired a take off 26 inch 6.5x47 26 inch barrel from bolt gun. I decided I will make 6.5 Grendel out of it. Borescoping It shows I could get 22 inches of good barrel by cutting off the full chamber, and cut the muzzle and thread it.

After chambering, the challenge would be how to turn down the breech side down to proper dimension for the barrel nut clearance. The tapered barrel is too cumbersome to turn between center.

This is the perfect application for the rotating tailstock spider. When I was looking for a live center, Mickey pointed out a Royal with interchangeable tip on eBay, which I end up buying. I thought about sending it for reconditioning and acquire tips for it, then the light bulb turned on. This will be the perfect candidate to convert to tail stock spider. Just machine the spider to screw into the live center.

I sketched up the spider, but I could start not on it due to the workload I had - lots of barrels. At that same time frame I was in conversation with Jeff S, Z2V, about spindle bearing play he was having with PM1236. It was pretty sloppy, it came that way. When he got the slop taken care of, I asked him if he were open for a challenge, I sent him a very rough sketch of the spider to review. He agreed to tackle it, and he got it done fairly quickly.

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Thank you, Jeff.

Back to the Grendel barrel. I normally cut a register past the barrel extension after finishing the tenon. The register being on the same axis as the bore centerline and chamber, I use it to indicate the barrel when I start turning it down to finish dimension.

See the shiny section just past the barrel extension, the register. I turn this section between 0.015 to 0.020 over finish dimension

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Now on the TS spider on this application, I chucked up the muzzle side in set tru using a copper ring for the barrel to pivot on. The barrel extension is held by the spider jack screws, and that side is dialed in on the register I turned down after finishing the chamber/tenon. Had to re-position the QCTP for the VNMG carbide cutter to clear the spider. Turning was toward the HS side.

Her are some more pictures

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@darkzero -
WOWSERS! That's absolutely great. I'd actually bought some of those holders (originally intended for screwdrivers) not too long ago, but found it hard to get the screwdriver shank exactly into the little vee slot - they'd always want to go in too far. Gonna haveta look in my Goodwill box, in the hope I haven't actually gotten rid of them. If they're gone, I'll be hitting up Amazon again. Thanks!
 
There has been some serious vandalism in my machine shop, the place is a real mess. By the looks a small cat has gotten in my machine shop and run all night long thru all of my tool shelves knocking over everything, even broken couple of floor tiles when knock down couple of spare set of chuck jaws, lots of oil on the floor. This will require some degreaser.
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GoceKU said:
There has been some serious vandalism in my machine shop, the place is a real mess. By the looks a small cat has gotten in my machine shop and run all night long thru all of my tool shelves knocking over everything, even broken couple of floor tiles when knock down couple of spare set of chuck jaws, lots of oil on the floor. This will require some degreaser.
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Bummer!
 
GoceKU said:
There has been some serious vandalism in my machine shop, the place is a real mess. By the looks a small cat has gotten in my machine shop and run all night long thru all of my tool shelves knocking over everything, even broken couple of floor tiles when knock down couple of spare set of chuck jaws, lots of oil on the floor. This will require some degreaser.
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Did they take anything or destroy machines? I don't like small cats that damage stuff.
 
savarin said:
If a dog does it its an accident and can be excused, if a cat does it its intentional and requires immediate rectification.
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You can NEVER trust a cat, evil creatures.................we always have one or two in residence......
 
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