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Type: Posts; User: rcoope

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  1. 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...
  2. 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...
  5. 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...
  9. 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!
  14. 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...
  16. 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...
  17. 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...
  18. 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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    That drawing is in millimeters yes? How thick is...

    That drawing is in millimeters yes? How thick is it? Without knowing anything else about the part, it seems small for MDF to be the best material choice. If it's say 1/4" or 1/2" thick I'd suggest...
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    We don't even own an Okuma but threads like this...

    We don't even own an Okuma but threads like this are why PM is great!
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    I'd go out for quotes from laser and punch shops...

    I'd go out for quotes from laser and punch shops with your material of choice and see what they say. And if there are concerns about the HAZ, is there a test you can do? I'm guessing at that...
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    That is genuinely weird. Of course, as with many...

    That is genuinely weird. Of course, as with many things I have strong opinions about, it's because my views originate from a total fail. Back in the early 2000's we ordered up a bunch of .04" and...
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    Another vote for 100% get it laser cut and use...

    Another vote for 100% get it laser cut and use whatever the laser shop normally uses which in our case would be 5052. Heck, get the laser shop to bend it too if you don't have a real press brake....
  25. I'm curious about the fly cutter. 12000 rpm gets...

    I'm curious about the fly cutter. 12000 rpm gets you 12000*2*PI/60 = 1257 radians/sec. To get velocity, multiply by the radius, eg something at a 6" radius would have a velocity of 1257*6"/12"/foot =...
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