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Type: Posts; User: AdamC

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  1. Replies
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    1,683

    Yeah- has to be on top of a column. I didn't...

    Yeah- has to be on top of a column. I didn't assume he knew that and wanted to add it just in case. I feel that's an excessive requirement that I think a lot of us might assume we could design a...
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    1,683

    Too late! You are attempting to design and build...

    Too late! You are attempting to design and build a residence with apparently no engineering background. And you are looking for help on Practical Machinist.com! You aren't even on a house building...
  3. My company thinks profile with no datum means the...

    My company thinks profile with no datum means the surface must best fit match the drawing/model within the tolerance specified, but the surface can be anywhere.

    We use it where there is no clear...
  4. Dumb callout. Parallelism is a tolerance of form....

    Dumb callout. Parallelism is a tolerance of form. So those surfaces could be anywhere within the size tolerance limits. Profile can be used to locate a feature, but not without datums. So the profile...
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    1,148

    I guess you are entitled to your opinion, but I...

    I guess you are entitled to your opinion, but I just wanted to say I find this point of view annoying. Respectfully, he's not asking for your opinion of the definition of the word "restoration". This...
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    I may be mistaken, but I believe I replaced mine...

    I may be mistaken, but I believe I replaced mine with new from H&W and they were sealed bearings. Can someone confirm?

    Otherwise, I get where you are going here. I wonder if you would be better...
  7. Replies
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    1,715

    Just guessing, but I'll bet a lot of Greg's...

    Just guessing, but I'll bet a lot of Greg's troubles revolvs around steel bolts in aluminum blocks sealed in with lock tite. That's happened to me. Its not so much that I damaged the thread, but the...
  8. Metric inch conversion is only one advantage of...

    Metric inch conversion is only one advantage of digital calipers. Being able to measure something that you can't see is a pretty nice feature. Many times I've reached my digitals into a restricted...
  9. Can someone please send me a link to the Mits to...

    Can someone please send me a link to the Mits to avoid? I have 500-196. Are they the cheapies? They were probably $135 on sale. No SPC, not coolant proof.
  10. Anybody else think that's a weird comment from an...

    Anybody else think that's a weird comment from an instructor? What Mitutoyo calipers have more "give" than others? As to accuracy, I don't think of any calipers as being particularly accurate tools....
  11. Replies
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    1,715

    If you live in the States, buy as you need might...

    If you live in the States, buy as you need might be a smart approach. No disrespect to Zimbabwe, but I feel like if you are fixing heavy equipment in Southern Africa, you probably need it when you...
  12. Replies
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    3,860

    Sorry, I thought you were saying that a grave...

    Sorry, I thought you were saying that a grave stone manufacturer could machine a stone flat enough to be used as a surface plate.
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    OP said he was looking for grade B. He didn’t...

    OP said he was looking for grade B. He didn’t mention the size of his plate(s). Grade B for a 24x36 would be flatter than .0004”. Smaller grade B plates would have to be flatter than that.

    I...
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    3,860

    Did you watch the video? Is that how grave stones...

    Did you watch the video? Is that how grave stones are made near you? Same tools? Really? Autocollimator? Stones in the video could be flatter than 75microns. That’s .000075”
  15. Replies
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    3,860

    That’s a joke, right? Is that some inside joke...

    That’s a joke, right? Is that some inside joke here that I don’t know?
    This is what I’m thinking about:

    YouTube
  16. Super smart to buy used tooling when you are...

    Super smart to buy used tooling when you are getting started. For mill work, you really need a "thousandths" 0-.030" and a "tenths", 0-.005" test indicators. The Brown and Sharpe will be a favorite....
  17. Replies
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    Just checked ebay.de for fun. You are correct. My...

    Just checked ebay.de for fun. You are correct. My advice sucks. The Starrett mics available in ebay.de are mostly inch reading and many are shipping from Great Britain.

    On the flip side, there...
  18. Replies
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    I chose used micrometers over new Chinese and I’m...

    I chose used micrometers over new Chinese and I’m happy with my choice. I have digital mitutoyo 1-3” and old WW2 era Starrett #436 1-3”. I like using the Starretts. They are smooth operating and easy...
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    Chaotic Bliss was correct. Since 2009 the ASME...

    Chaotic Bliss was correct. Since 2009 the ASME std contains a rule that flatness is implied at MMC of a thickness tolerance. So a bar that is .5000-.5006 must be perfectly flat at .5006. Flatness...
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    There is a company in Lititz called Garber...

    There is a company in Lititz called Garber Metrology whose website says they recondition surface plates. I have no experience with them, but I'm looking for a similar service.

    If you contact...
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    I wasn't trying to be a smart @ss about the level...

    I wasn't trying to be a smart @ss about the level tolerance. I suspect bolting a mill to a wall is a bad idea. I'm thinking about how the wear surfaces are oiled, how the oil runs over surfaces etc....
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    Resonance happens when the frequency of the...

    Resonance happens when the frequency of the excitation (tool) matches the natural frequency of the item/structure of interest (mill).

    So, if the speed and feed of a cutter sets up some sort of...
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    Why does it have to be level? Level to within...

    Why does it have to be level? Level to within what tolerance?

    I think we put feet under them so we can slip a pallet jack under them to move them. A leveling foot that is 3” in diameter results...
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    Can I add a related question that I'd like to see...

    Can I add a related question that I'd like to see as a sticky? If we change the spindle bearings, will we then HAVE to regrind the R8 taper? Did Bridgeport grind the tapers with the spindles...
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    Sorry if this is useless to you: I'm doing...

    Sorry if this is useless to you: I'm doing something similar. I want to slip my pallet jack under my mill, but I want to do it from the front OR from the side.

    So here's my question(s): How do you...
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