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Type: Posts; User: JimBuchanan

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  1. Replies
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    Amen. I did it and it looks better that the cast...

    Amen. I did it and it looks better that the cast original:

    https://www.practicalmachinist.com/vb/south-bend-lathes/sb9a-restore-retrofit-3-phase-vfd-363926/index3.html#post3383500
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    Up thread in a video, I detailed a hall effect...

    Up thread in a video, I detailed a hall effect tachometer with the magnet attached to the small cone of the spindle pulley. At the time, I would do a mental divided by 5 when using the back gears....
  3. Interesting thread as I am thinking of getting...

    Interesting thread as I am thinking of getting either a 5" or 6" Shars 3 jaw, 2 piece chuck for my 9A. Sorry, I can't afford anything more. But since I have a very nice tight Skinner 4006 6" 4 jaw,...
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    Deciding to move ahead on a new motor pulley,...

    Deciding to move ahead on a new motor pulley, here is a double pulley for a Poly V 6 rib direct to spindle cone pulley. The low speed pulley is 1.9" diameter and the high speed pulley is 2.4". This...
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    I had a left over 3" chuck and spindle from a...

    I had a left over 3" chuck and spindle from a mini-lathe when I upgraded it to a 4" chuck, spindle and steel gears. After I traded up to this SB 9A, I thought it would be a good idea to be able to...
  6. Replies
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    The automotive poly V belts are designed to be...

    The automotive poly V belts are designed to be used with grooved pulleys. If they can provide increased traction with less sideways load on a 9A spindle, why wouldn't that be a good thing?

    As far...
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    Since you mentioned this, a further thought. The...

    Since you mentioned this, a further thought. The 5 ribbed .8" wide serpentine belt I used is tensioned the South Bend recommended 1" flex between the motor and spindle cone pulley. It gives good...
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    I would have liked to have seen parting 5.5"...

    I would have liked to have seen parting 5.5" diameter. . . Why would you disassembly a 6 pole 1140 rpm motor with c/shaft that was performing so good?

    I'm liking my 6 pole 1140 rpm motor a lot....
  9. Replies
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    I am using my retro-mod 9A initially to gear up...

    I am using my retro-mod 9A initially to gear up capabilities. Here is a thread dial I made for $6. $4 for the 16 tooth gear from China, $2 for a 3/4" hex bolt that is the body of the unit and a 1/4"...
  10. Replies
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    Nice re-built 9A. If I ever do another one, I...

    Nice re-built 9A. If I ever do another one, I will try the electrolysis reduction method of turning brown rust back to metal.
  11. Replies
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    Sticky: Making a Thread Cutting Stop. Not totally...

    Making a Thread Cutting Stop.

    Not totally necessary with a 9A, but making the process a little easier, I saved a little money and made one for no cost and it matches the color perfectly.
    259493
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    Thanks, for the "help".

    Thanks, for the "help".
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    Feedback request on belt slippage

    Now that the "retro-mod" 9A/VFD is online and I'm getting experience with the greater cutting capacity over the little chinese mini lathe, I'd like to ask for feedback on acceptable cutting capacity...
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    First item, I pulled from the garbage can to take...

    First item, I pulled from the garbage can to take a photo, is the Harbor Freight rubber caster wheel cut from its base and chiseled keyway to fit the motor shaft in order to turn the original SB...
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    Interesting. So, any comments on the fiber V belt...

    Interesting. So, any comments on the fiber V belt versus regular V belt in operation? Or, compared to the flat belt if that's what you had originally.

    When I was considering the V-belt cone pulley...
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    https://drive.google.com/open?id=1-6BzGlTiNjdvPXAX...

    https://drive.google.com/open?id=1-6BzGlTiNjdvPXAX-j8ITfOdW0cMp6Tr
    Look ma no hands!

    This is a big deal to me, power crossfeed. I have been wanting this for a long time. As said by fellow PM...
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    258564 Yes, I agree with most here that the SB9...

    258564
    Yes, I agree with most here that the SB9 is a machine for slow speeds and HSS tooling, with a good working spindle speed range up to about 700 RPM.

    Attached is a general torque curve from...
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    258514 Here are the "final" spindle RPMs for...

    258514
    Here are the "final" spindle RPMs for this setup. VFD to deliver 93% of cycles for a spindle speed of 600 RPM. This cuts off the vibration I was getting above that. I still think the...
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    To start a rap up of this project, I will tell...

    To start a rap up of this project, I will tell one more thing before I summarize and detail my expenses. When finished with the rebuild, I had 5 lock washers and a pin left over. I wasn't too...
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    The Precision Matthews 10" weighs more than the...

    The Precision Matthews 10" weighs more than the SB9A and more than my iteration. Your comparing a 350 LB SB9 to a 1000 LB lathe? I guess so.
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    I knew someone was going to say something about...

    I knew someone was going to say something about the mount! Spell it out for me because I'm a machinist impostor.

    Isolation? The new breed Taiwanese lathes are gear headed right? Where's the...
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    https://drive.google.com/open?id=1-1MW1UvdWgifE_DB...

    https://drive.google.com/open?id=1-1MW1UvdWgifE_DBcLspQ-aIn_swtIN6
    There are 3 parts, motor at 100% of 60 Hz with no belt load, 100% of 60 Hz with belt/spindle
    load, and 100% of 60 Hz with...
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    https://drive.google.com/open?id=1t1X2q7Sx6CRtSZwf...

    https://drive.google.com/open?id=1t1X2q7Sx6CRtSZwf-TJjMhYlkYWZlz1w
    This shows how the motor mount is located. I'm not saying I will not redo the mount in the future, but the lathe is operational...
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    https://drive.google.com/open?id=11S9MiiUIrJkMET8Y...

    https://drive.google.com/open?id=11S9MiiUIrJkMET8YgwHvPP5XuphKWD0W
    This is a 2nd attempt to get this video up for viewing. And the link seems to work!

    The general layout and mechanics are shown....
  25. Anyway to get in touch with our moderator? PM box full.

    Anyway to get in touch with our moderator? Title says it all.
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