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This Mornings Machining Project

Discussion in 'Builds and Fabricators Forum' started by Mcruff, Dec 5, 2017.

  1. Jan 21, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
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    Tarry, the gears are case hardened, about .060-.070" deep, the outer casing is probably around 58-60 on the rockwell C scale. Darned hard, once you get thru that it is just tough material, kind of like machining 4140. I suspect that it is sae 8620 which is what most modern gears are made from and induction heat treated. The insert in the picture is just a generic that was worn down. I think it is a Kennametal K68 general purpose (C3) TCN insert. You can also use K313 inserts (C3-C4) in its place. The main reason I use these is because I have 2 small fly cutters and several lathe tools that use the same insert. I have been finding these on Ebay and local flea markets. They are generally cheap compared to most others. There was no real reason for the 7* other than they were available easily and I have use for them in multiple tools. The 11* is little more fragile on the edge of tough material but does leave a better finish if the material is not to tough or hard. Sometimes its a crap shoot and you need a little finesse to get the job done. I have them in both .016" radius and 1/32" radius tip. I also grind a chip breaker on them with my diamond wheel as needed and hone them with a diamond or ruby lap. The one pictured is a 322 series insert. 3/8" inscribed, 1/8" thick and 1/32" radius. I do run these a little faster when boring to help with chip breakage, I do not generally use lube with carbide, I do use water soluble sometimes if the part is getting to hot. In the real world you would rather the chip be blue, that means its carrying the heat away from the part, and not keeping it all in the part your working on.
     
    Last edited: Jan 21, 2018
    73 cj5, Danefraz, mike starck and 2 others like this.
  2. Jan 24, 2018
    fhoehle

    fhoehle Sponsor

    Harford Township, PA
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    I know where the gear came from.....
     
  3. Jan 24, 2018
    fhoehle

    fhoehle Sponsor

    Harford Township, PA
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    I can do nice sturdy fabrication, I can weld well and work heavy equipment well and build fairly nice, utilitarian stuff. Looking at your guys' conversation though makes me feel like the kid standing there saying "I ate a rock."
     
    73 cj5, Danefraz, dozerjim and 9 others like this.
  4. Jan 29, 2018
    fhoehle

    fhoehle Sponsor

    Harford Township, PA
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    The gear you machined for me worked great! Thanks again!
     
  5. Jan 29, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
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    Your welcome!
     
  6. Feb 21, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    Well today I had another project, actually 2 of them. One was to replace the damaged stud on a brake pedal arm, the other was to bore out another brake arm that had a wallowed out hole and put a bushing in it.

    New stud.JPG

    Stud sideview.JPG

    Arm 1.JPG

    Arm 2.JPG

    Arm and Bushing.JPG

    Bushing installed.JPG
     
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  7. Feb 22, 2018
    willys59cj5

    willys59cj5 Sponsor

    Gilroy, CA
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    Beautiful work Mike! It was very nice meeting you/talking with you the other day!
     
  8. Feb 22, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    I haven’t forgot you Ryan, working on your fitting today. Was great getting to talk to you also.
     
  9. Aug 22, 2018
    tripilio

    tripilio Proud American! 2020 Sponsor

    Miami
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    Can you please, give us mortals the part number of the sealed cone bearings? Thanks!
     
  10. Aug 22, 2018
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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  11. Aug 22, 2018
    melvinm

    melvinm Member

    Arvada Co. 80003
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    Looking at the part numbers Timken LM11710 / LM11749 I don't see A sealed version of this assembly.

    For A bell Crank with tapered roller bearings try.

    1 st Gear Off-Road-Products
    1247 S. Buena Vista
    Unit -C
    San Jacino Ca. 92583
    Phone 951-654-4532
     
  12. Aug 28, 2018
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
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    Looks like a brake lathe cutter. The cutter insert that is.
     
  13. Sep 3, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    I built a ball turner/radius cutter for my lathe awhile back. I had not finished it until today. This fixture is for turning radii on the corner of parts or turning a ball shaped object. I can adjust the size in .001" increments up to 1.000 radius. I needed a ball shaped handle for the turner so I used the fixture to turn the handle for itself. This little fixture actually worked quite nicely and I was impressed by the finish it left. The machine finish was good, I buffed it with rouge to shine it up before installing it on the fixture handle.

    IMG_4394.JPG

    IMG_4396.JPG

    IMG_4398.JPG

    IMG_4399.JPG

    IMG_4400.JPG
     
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  14. Sep 3, 2018
    Focker

    Focker That's a terrible idea...What time? Staff Member 2019 Sponsor

    Tri-Cities WA
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    I like pic one as is... Cool shift knob. :sneak:
     
  15. Sep 3, 2018
    tripilio

    tripilio Proud American! 2020 Sponsor

    Miami
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  16. Sep 3, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    Are you talking about the fixture on the lathe? It is locked into the cross feed compound. The older South bend lathes used tapered round wedges in holes on the side of the compound, they are locked down with set screws in the sides of the compound.
     
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  17. Sep 3, 2018
    tripilio

    tripilio Proud American! 2020 Sponsor

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    Actually I was referring to the boring of the pedal arm.
     
  18. Sep 4, 2018
    47v6

    47v6 junk wrecker! 2020 Sponsor

    Washington DC.
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    Ok, so the holder for the carbide insert can move in and out to made differing radius jobs. What holds it down? The entire fixture can rotate? Does it do this manually with the arm and the ball you made for it? Do you just rotate it by hand? How did you made the fixture ridged enough to stop chatter? This is really cool.
     
  19. Sep 4, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    The stud on the pedal arm is clamped in a V block. The pins and spacers help keep it from twisting.
     
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  20. Sep 4, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    There are 3 set screws in the side of the round base that clamp against the sliding portion. The base is clamped with its dovetail in the saddle. The upper round base is built with .0007 clearance for movement and is held together with a flat head in the bottom. It is so smooth with the grease in it there is no movement up and done.
     
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