Keeping tight tolerances
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Thomas Janstrom
So not that I was aiming for tight tolerances/minimal runout but then who goes looking for bad run out? I finally after 15 years got around to making the back plate for the old 5" 4 jaw chuck I ebay scored (back when ebay was a gold mine) for little more than the postage it cost to ship to Australia.
Anyway long story short it finished out with an average runout of .015mm or 6/10000" in the old money not that it really was needed for this application but nice to know the old girl still has it in her.  As an aside the chuck was made by General Machine tools Mass. No idea when, but it stripped a screw and was repaired at some point (not visible in this shot), next job is making the chuck key. Anyway I hope you all have as rewarding a weekend as I did. Thomas. |
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John Dammeyer
Nicely done. I see the metal chips and the shiny back plate. But the castings look almost green. Is that moss?
From: gingery-machines@groups.io [mailto:gingery-machines@groups.io] On Behalf Of Thomas Janstrom
Sent: November-14-21 2:19 AM To: gingery-machines@groups.io Subject: [gingery-machines] Keeping tight tolerances
So not that I was aiming for tight tolerances/minimal runout but then who goes looking for bad run out? I finally after 15 years got around to making the back plate for the old 5" 4 jaw chuck I ebay scored (back when ebay was a gold mine) for little more than the postage it cost to ship to Australia. |
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That would be some nice work! I was glad the backing plate for my Atlas TH42 was going on a 4-jaw independent jaw Shars chuck, as I goofed it really bad in one of those forgetful moments. At least with that chuck, I can adjust it out. You can, but don't need to... ;) They say "If you can't be good, be lucky." I can't manage either. Bill in OKC William R. Meyers, MSgt, USAF(Ret.) A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects. LAZARUS LONG (Robert A. Heinlein) On Sunday, November 14, 2021, 11:20:20 AM CST, John Dammeyer <johnd@...> wrote: Nicely done. I see the metal chips and the shiny back plate. But the castings look almost green. Is that moss?
From: gingery-machines@groups.io [mailto:gingery-machines@groups.io] On Behalf Of Thomas Janstrom
Sent: November-14-21 2:19 AM To: gingery-machines@groups.io Subject: [gingery-machines] Keeping tight tolerances
So not that I was aiming for tight tolerances/minimal runout but then who goes looking for bad run out? I finally after 15 years got around to making the back plate for the old 5" 4 jaw chuck I ebay scored (back when ebay was a gold mine) for little more than the postage it cost to ship to Australia. |
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Thomas Janstrom
The castings are bronze and 20 years of living by a major road as not done them any favours (diesel exhaust is hell on copper based alloys), but I'm glad the old girl is still going strong. Next major upgrade is a new lead screw, going to be 1/2" x10 acme....
Thomas. |
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John Dammeyer
Pictures?
From: gingery-machines@groups.io [mailto:gingery-machines@groups.io] On Behalf Of Thomas Janstrom
Sent: November-18-21 11:42 PM To: gingery-machines@groups.io Subject: Re: [gingery-machines] Keeping tight tolerances
The castings are bronze and 20 years of living by a major road as not done them any favours (diesel exhaust is hell on copper based alloys), but I'm glad the old girl is still going strong. Next major upgrade is a new lead screw, going to be 1/2" x10 acme.... |
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Thomas Janstrom
there will be once I start the upgrade, but for now I'm waiting for a 1/2" x 10 acme tap to arrive and my Christmas leave to start (~4 weeks time on both), so I will keep you all posted.
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