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Type: Posts; User: Conrad Hoffman

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  1. The photo looks a lot like old musket balls or...

    The photo looks a lot like old musket balls or maybe copper. Hit one with a hammer. Is it soft?
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    IMO, at 50-100 pieces no normal person will be...

    IMO, at 50-100 pieces no normal person will be able to afford this. Machined parts in this country are expensive. You should make up detailed drawings, with tolerances, and do an RFQ here to get some...
  3. I believe methanol is the best alcohol for...

    I believe methanol is the best alcohol for removing fingerprints. IMO, alcohol in general isn't very good for oils and greases. One of the more annoying things I clean is the gunky film that comes...
  4. I used to clean very soft scientific coatings on...

    I used to clean very soft scientific coatings on interferometers and the first rule was not to clean unless absolutely positively necessary. We used a technique called drag wiping. This only works on...
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    Visual CADD is a great program that grew out of...

    Visual CADD is a great program that grew out of the old Generic CADD. If one took advantage of a trade-in deal or otherwise got in early, it's a bargain, but IMO it's too expensive for the hobbyist...
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    The business end of the brace seems quite long....

    The business end of the brace seems quite long. Entirely feasible that it could drop down a distributor hole and prime the oil pump. I have a rod I use in an electric drill for the same purpose....
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    I wonder if you got to keep your job if you made...

    I wonder if you got to keep your job if you made a mistake on those size parts?
  8. I bet using it would be a wallet hazard!

    I bet using it would be a wallet hazard!
  9. Well, if it's going to explode, it might as well...

    Well, if it's going to explode, it might as well spew radioactivity all over the place.

    Seriously, this may not be a dead end yet. I think I have a way to isolate any possible ignition sources and...
  10. Some of my parts have sections more like thin...

    Some of my parts have sections more like thin ribbon, and my risk tolerance is very low. That said, what parts of a top fuel car are made of magnesium? I see things like valve covers, but not the...
  11. Well, now you've done it. The collective wisdom...

    Well, now you've done it. The collective wisdom here is so good, you've scared me into keeping the aluminum. Even though a finished part is nothing like a thin chip, and would be far harder to...
  12. Titanium is way heavier. Stronger, but there's no...

    Titanium is way heavier. Stronger, but there's no freedom to remove more material to lighten the parts.
  13. Very low volume on this, probably 3 sets of part...

    Very low volume on this, probably 3 sets of part to start with, but we expect to pay accordingly. 3 "sets" still translates into a couple hundred of one of them. Should have some prints in a week or...
  14. Price good, shipping not so much! You can...

    Price good, shipping not so much! You can certainly make the needed fixtures to calibrate air plugs, though I've never attempted to make the plugs themselves. I used to use Edmund air gauges and...
  15. Air gaging works great for this sort of thing, as...

    Air gaging works great for this sort of thing, as it can do the precision and is self cleaning. The range of the plugs or fixtures can be large enough, but the basic plug or fixture might cost a bit...
  16. Switch material from aluminum to magnesium alloy

    We need to reduce the mass of some small aluminum (6061) parts. We've already removed as much metal as possible, so the next step would be to machine them from a magnesium alloy. It seems as simple...
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    As above, get it close than use Simichrome or...

    As above, get it close than use Simichrome or Mother's Mag Wheel Polish. I think they include something that gives you some chemical action plus the abrasive action. Makes a black mess, but really...
  18. Some watchmakers make these cutters themselves-...

    Some watchmakers make these cutters themselves- Wheel and Pinion Cutting

    Flycutting might be easier. EDM probably easiest of all.
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    No, the clever thing is how they arrange the flex...

    No, the clever thing is how they arrange the flex point. Normally, a tool digs in a bit and moves towards the work, digging in more. Imagine the tool post bending in a bit towards the work under...
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    Gooseneck tool holder? More on Spring tools...

    Gooseneck tool holder?
    More on Spring tools
  21. We make parts with decent accuracy, but after...

    We make parts with decent accuracy, but after years of tears we've learned never to use two dowel pins in holes. Always one pin in a hole and one pin in a slot.

    As far as accuracy, I've always...
  22. We degas most of our epoxies in a small...

    We degas most of our epoxies in a small centrifuge, rather than vacuum. Just be careful with fillers, as they can end up at the bottom of the mix!
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    Look here- End-of-Arm Tooling for Cobots | New...

    Look here- End-of-Arm Tooling for Cobots | New Scale Robotics Down the page a bit, we can mount you up a triple set!
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    I've had the problem when everything is set up...

    I've had the problem when everything is set up right. Check the tool height and check that the clearance angles are sufficient.
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    You've got a mill. Just do the X-Y locations of...

    You've got a mill. Just do the X-Y locations of the holes in the needed plate and go to town. CAD makes it easy, but calculators still work too. Definitely don't reverse direction with a dividing...
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