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Type: Posts; User: Conrad Hoffman

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  1. Replies
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    499

    0.166 degrees? Seems iffy, or at least darn...

    0.166 degrees? Seems iffy, or at least darn expensive.
  2. FWIW, if you have any sort of belt driven table...

    FWIW, if you have any sort of belt driven table saw, probably other than a 3-belt Unisaw, put a Fenner belt on it. Way less vibration.
  3. I've had a Powermatic "Artisan" with cast iron...

    I've had a Powermatic "Artisan" with cast iron wings for many years. Like any import machinery, it required hours of fiddling and correcting before I was happy with it, but it's served me well. IMO,...
  4. Regarding the Belleville washers, angular contact...

    Regarding the Belleville washers, angular contact bearings are not going to work without a preload. That's also the reason they caution against grinding anything on the back side of the wheel- it...
  5. Make sure the Belleville washer preload is...

    Make sure the Belleville washer preload is working correctly and the bearing can move easily in the bore. My bearings were ancient but with a cleaning and new grease they work just fine. They don't...
  6. Apologies in advance, I can't help myself. ...

    Apologies in advance, I can't help myself.

    Best way to get rid of a small machine shop?

    Buy more machines so you have a big machine shop!
  7. We use a video microscope system called...

    We use a video microscope system called SmartScope from OGP. Reasonably easy to program thread measurements but you still have to hold the part correctly. On thread wires, the tolerance and quality...
  8. We use the 293s at work and they're very good. I...

    We use the 293s at work and they're very good. I bought one for home too. Still, as said above, technique is everything. Under ideal conditions they repeat to the last digit. Less than ideal...
  9. Replies
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    900

    Very cool and not that far from me, but I'm not...

    Very cool and not that far from me, but I'm not up to dealing with anything that large and heavy these days.
  10. I wouldn't expect a ring gage to have the actual...

    I wouldn't expect a ring gage to have the actual size marked any more than I'd expect it on a gage block. The actual measurement should appear on the calibration certificate. AFAIK, rings are ground...
  11. Replies
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    IMO, big profits are just around the corner and...

    IMO, big profits are just around the corner and always will be. Too much competition in the 3D market because it's a "thing".
  12. Replies
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    1,084

    Not sure, but can a half round drill get a better...

    Not sure, but can a half round drill get a better finish than a reamer?
    Sharpenning hlaf-round drills?
  13. We run one in an oven so I'd think the...

    We run one in an oven so I'd think the refridgerator is OK. As for dry ice, nobody around here sells it. I think if I drove to the nearby city there's maybe one supplier. Which brings me around to...
  14. I think I saw a cheap one in a recent Travers...

    I think I saw a cheap one in a recent Travers Tool flyer. It's something I've always been going to make, but never get around to it.

    here? https://www.travers.com/manual/c/298636/
  15. Replies
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    3,701

    No dislike of BPs here; I'd love one for the...

    No dislike of BPs here; I'd love one for the garage shop. They do great in the instrument shop at work. Still, people ask too much of them. Even with the best DRO they're not a 0.0005" machine. They...
  16. I'd be surprised if the plate was hard but you...

    I'd be surprised if the plate was hard but you never know. IMO, the 5/16" should work fine if they slip through the holes.
  17. Have an old one, no trouble with it. For any...

    Have an old one, no trouble with it. For any center punch, grind it "bright". That means the grinding direction is parallel to the axis and the tip is way easier to see.
  18. Replies
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    794

    That second image looks like the wheel has picked...

    That second image looks like the wheel has picked up something or has some grains that haven't broken down. The pattern is close together, assuming normal travel rates. Balancing problems usually...
  19. Replies
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    794

    A picture of the surface would help if you can...

    A picture of the surface would help if you can get the light right.

    I'm a nut- Grinding Wheel Balancing
  20. Replies
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    690

    I have a similar spindle and replaced the...

    I have a similar spindle and replaced the bearings. I went with oil because of the high maximum speed, but in hindsight I should have used Kluber high speed grease. NCA-15 is what I have and rated a...
  21. Replies
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    I think the standard Sunnen honing oil is mostly...

    I think the standard Sunnen honing oil is mostly animal or vegetable oil with a lot of sulfur additives. It's strong point is preventing welding between the mandrels and parts. AFAIK, petroleum oils...
  22. I remember what I use and forget what I don't....

    I remember what I use and forget what I don't. That goes for any kind of computer language. IMO, you need to work with this stuff on a regular basis if you're going to get good at it. Just doing...
  23. I run a serpentine on my Logan right-side-up with...

    I run a serpentine on my Logan right-side-up with no problem. I used to run a Fenner belt on the V/flat pulleys as you see in the photos but I think I changed it to a regular V-belt with the notches....
  24. Multilayer motherboards can be a nightmare unless...

    Multilayer motherboards can be a nightmare unless you have the right equipment. I've done it with a Soldapullt DS017, but can't recommend it. You also need to be sure you buy suitable caps, which may...
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    Not sure why anybody would design or attempt to...

    Not sure why anybody would design or attempt to make close tolerance parts out of PTFE. I've machined the stuff with no problems but would never expect it to be stable better than .010" or so.
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