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Type: Posts; User: rcoope

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  1. Replies
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    Where I come from (research machine shops...

    Where I come from (research machine shops established by post-war European emigres where lightly used tools can hang around for a REALLY long time) they'd always have two sets of HSS drills, one for...
  2. In my experience 304 and 316 behave basically the...

    In my experience 304 and 316 behave basically the same and are both great materials to bend.
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    I was going to say you should seriously look at a...

    I was going to say you should seriously look at a CNC lathe with a good conversational control. Once you've made a couple of parts on, say, a TL-1 in my case, you cannot go back. And not only is CNC...
  4. Good approach TRBoatworks and I just had to pop...

    Good approach TRBoatworks and I just had to pop in to point out my favorite Vancouver area shop, KSM Fabricators, once made me 12' long bends in 12 Ga mild steel on their 10'
    press brake and you...
  5. It's fun to casually, but with unmistakable...

    It's fun to casually, but with unmistakable passion in your voice, explain to non mechanical people that there's this company McMaster-Carr that's been around since 1905 and blows Amazon out of the...
  6. Great job mayah. As my university shop teacher...

    Great job mayah. As my university shop teacher used to say, (imagine in a sort of Dutch/Canadian accent) "There's a right vey, and a wrong vey" I think you did it the right way. Also thanks for...
  7. Thanks for the thoughts. Upon reflection I do...

    Thanks for the thoughts. Upon reflection I do think a pro-vacuum bias had crept into the shop over the years and possibly also a perception that Delrin was expensive. Which it might have been at one...
  8. Old R&D Folks, Learn me up about Nylon/Delrin history

    I had a former engineering co-op student drop by the shop tonight to make parts for her class robot project and it led me to wonder when did we stop using nylon, because it sucks, and start using...
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    I've never had any problem getting anything in...

    I've never had any problem getting anything in Canada, it just sometimes costs more for shipping and brokerage. I've never had a specialty supplier not ship here.
    One way to reduce the tolerance...
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    Interestingly the tolerances on shim stock at...

    Interestingly the tolerances on shim stock at McMaster aren't super tight, eg .035" +/- .002" for spring steel and .00175" (what?) for 301 Half Hard. If someone could identify a supplier who makes...
  11. We did this for to create patient-specific brass...

    We did this for to create patient-specific brass compensator disks for proton therapy. The goal was to cut a hole of a certain shape, based on the tumour cross section, in the brass disk. The...
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    Was this one the subject of another recent thread...

    Was this one the subject of another recent thread where you got it out of a basement on the west coast or something, as I vaguely recall? I was looking at those photos with my wife because we were...
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    I don't spend my own money on tools, but as a...

    I don't spend my own money on tools, but as a biomedical prototype centre we both accumulate a lot of scientific and hospital stuff, and we do very general prototyping involving many different...
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    I'm going to reply too since I saw this old...

    I'm going to reply too since I saw this old thread and read down to where I was heckling Marcus, which I had totally forgotten about. To update our situation, we did end up getting funding for a VM-3...
  15. The key is that the controller on the right is an...

    The key is that the controller on the right is an Entron EN1000. See here: EN1000/EN1001 Multiple and LDC - Entron Controls Unfortunately the link to the English manual seems broken but you can see...
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    I'm not sure if they could put a five axis head...

    I'm not sure if they could put a five axis head on the protomax but the other option might be a special 2626 with the A-Jet head. Normally they only put them on the big machines as they really don't...
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    259351 I am so unable to get anything serious...

    259351

    I am so unable to get anything serious started this afternoon that I made you a CAD model of the hole just for fun.

    PDF Here: Dropbox - 10 inch pipe with 4 inch hole.PDF - Simplify your...
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    I doubt it; judging by the zinc coating it's...

    I doubt it; judging by the zinc coating it's totally a Grade 5 Home Depot fly by night contractor special, hence the burrs too. Limy Sami might be right it's off a turboencabulator but if so it's one...
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    Why is the price of scrap always dropping? I...

    Why is the price of scrap always dropping? I swear it was much higher when I started my career and it's been dropping ever since. Or at least it's dropping any time the subject comes up on PM!
  20. Thread: CNC for optics

    by rcoope
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    Great video Jerome, I look forward to more!

    Great video Jerome, I look forward to more!
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    If turning from wood or bone, it might be an...

    If turning from wood or bone, it might be an option to glue a blank on the end of the shifter shaft and turn the blank to shape with the shaft chucked in the lathe. I used to turn pieces of ebony...
  22. Robert R does make some great points, especially...

    Robert R does make some great points, especially about running used equipment on an intermittent duty cycle. In such cases water cooling is unlikely to be as much of an issue as it won't be on for...
  23. You're completely right crossthread I realized...

    You're completely right crossthread I realized after that we were talking about different machines. I think I was thinking of the bucket centrifuges because they would have a larger chamber. In DNA...
  24. I come from semiconductor physics and now work in...

    I come from semiconductor physics and now work in genomics so I have opinions! I would definitely chase down a surplus ultra high vacuum chamber or an aluminum high vacuum chamber. Eg this ex sputter...
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    A picture would be great. There may well be an...

    A picture would be great. There may well be an alternative approach than turning the projection into a stud, which is, I think, what you are describing.
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