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  1. G

    Bearing stress calculation, and why (caution: MATH ahead)

    Well said NT1953. In my opinion, Engineering is the process of measuring something and coming up with a formula that predicts the measured results over the full range of the experiment. The formula is then used to predict future results measured with similar conditions. Attempting to understand...
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    10L QC Gearbox Bushing Question (Single Tumbler)

    American Sleeve Bearing (https://asbbearings.com) is a company I have used several times, sometimes they have a direct fit but other times I end up getting something oversized and machining it down to size. As others have said take it apart and see what you need. I will be doing the same to my...
  3. G

    Featherweight Straight Edge Availability and Prices---Very Reasonable

    Thanks for the video, very nice. What is used as a heat source?
  4. G

    Need advice to clean up a MT2 socket

    So I guess you are using the engraving burr on something like a Dremel tool? I had thought about using a small grinding wheel on a dremel. I am ordering some 4" long 1/2" diameter round stones to try. The riffler file seems like a good idea, have not tried that. This is MT2 so my fat fingers can...
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    Need advice to clean up a MT2 socket

    Thanks for the photo, that is a large chunk of carbide, I guess it would be rare. I googled babbit scraping to get some idea of how it works. I think I will call it good enough for now, I can always go back and work on it more later if it causes a problem.
  6. G

    Need advice to clean up a MT2 socket

    Very interesting, what is a CN reamer? How does a carbide taper scraper work and what does it look like? Is it possible to scrape a taper for alignment? I am at the stage now in rebuilding this lathe to try to get the tailstock spindle as good as I can reasonably get it. A new spindle may be in...
  7. G

    Need advice to clean up a MT2 socket

    I do have a taper attachment and I was relatively successful at reboring a drill press Mt2 spindle taper. The challenge I found with that case was getting the spindle spindle both concentric and parallel to the axis of the bearings. With the tailstock I do not think there is much of a concern...
  8. G

    Verifying if the spindle is properly lubricated (SB16" 117C)

    Jim, Thanks for that tidbit, I was wondering...
  9. G

    New 9A Cross Feed Help

    I have straightened several shafts that way, I usually set up a dial indicator that show how far past center I bent it then slowly keep increasing the overdrive until it is bounces back to straight. Its easy to go too far. If the arbor press is not too big you may be able to get a feel for the...
  10. G

    Need advice to clean up a MT2 socket

    I understand the reamer will follow the existing hole. My question is more about technique, I guess I should be able to use the MT2 reamer turning it by hand with a tap wrench and some amount of downward force with lots of light oil, perhaps something like wd40? I have heard to never turn it...
  11. G

    Need advice to clean up a MT2 socket

    Here is what I have tried. The inside of the 1940s south bend 10L lathe tailstock spindle was all chewed up. I have several MT2 reamers, not sure where they all came from, one was a set from Grizzley (india) roughing and finishing set, others from boxes of tools from classified ads. I grabbed...
  12. G

    Plan for aligning head and tail on SB 10L

    The HS is now 0.0009 inches high and 0.0010" towards the front. This is with the HS bolted down, 1.7" x 11.25" test arbor but still without the bearing caps installed and adjusted or the flat belt installed. Bolting it down did change things a little. So I feel like I am pretty close or at least...
  13. G

    Plan for aligning head and tail on SB 10L

    Richard, I have no intention of trying to teach anyone anything on this forum and I apologize again if I have given any other impression. I intend to do exactly as you and Jim and jwearing have recommended. I have measured the bottom of the TS on parallels as suggested and have 0.005 taper so it...
  14. G

    Plan for aligning head and tail on SB 10L

    Richard, In my original post I noted I have scraped the interface between the top and bottom, they now fit nice with good blueing transfer, the cross slide is tight. The bottom of the base was measured on the granite but there was not much original surfaces left on the bottom. A little ridge...
  15. G

    Plan for aligning head and tail on SB 10L

    On the question of test bar lengths and diameters I realized I could get an approximate answer by calculating the deflection assuming the test bar is a fixed cantilever beam with uniform load (the weight). This is case 10 in machinery's handbook. I picked 0.0001" as an acceptable deflection. The...
  16. G

    Plan for aligning head and tail on SB 10L

    Jwearing, that is an excellent idea, I just lifted up on the end of my test bar with a force of about 1/2 its weight and it moved up 0.0003", then I came upstairs and read your post. I think I like your idea better. What is the hole in the center of your bearing cap? Do you have the brass...
  17. G

    Plan for aligning head and tail on SB 10L

    Richard, Interesting book, I am going to have to spend some more time with it. What I am doing for spindle alignment is the same thing shown in fig 59 pg 34. I have still not seen anything that mentions what the test bar length should be for a smaller lathe but it might be in there someplace...
  18. G

    Plan for aligning head and tail on SB 10L

    Interesting web site, Kinematic couplings are a subject of interest to me also, used a fair amount in the semiconductor industry.
  19. G

    Plan for aligning head and tail on SB 10L

    I am always very interested to see how the pros do it. Often I read the posts and have a DUH, why didn't I think of that moment. I apologize if anything I said came off as argumentative. I usually try to remember to point out that I am an amature in these matters. I always struggle trying to...
  20. G

    Plan for aligning head and tail on SB 10L

    I can see the advantage of having test bars that are all exactly the same diameter as the quill, there are no calculations needed. However it is now pretty easy for me to measure the test bars like in my original post. The quill and test bar diameters and the equations are all in the spreadsheet...

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