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  1. C

    Tube expanding calculator

    Thank you. Calculating the area works great for this. I tried it "manually" and now I'd like to find a good online calculator to make much faster. No need for a full calculator of "wall thickness". I found a good calculator for annular ring area (and also found it is called an annular ring in...
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    Tube expanding calculator

    Hi I just tried Chat GPT for this and I'm not sure if it's right... Is there a decent and simple calculator for calculating change in wall thickness when expanding a tube? I don't think the expanding method makes a difference? If it does, then I mostly use a rolling method (same as how...
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    Mis-matching thread angles and holding small tubing

    Thank you. I'm not sure what's considered thin or thick wall for a tube, I guess around 0.5mm for 4mm OD tube is thick? I was just wondering if there's something I'm missing and holding a tube is trickier than still-holding a tube that became the same tube because it was drilled. I guess it's...
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    Mis-matching thread angles and holding small tubing

    Two unrelated questions... 1) Trying to envision what would happen when using a "screw" and a "nut" with different thread angles. The quotes are only because it's specific parts that are not exactly a screw and a nut but essentially the same. Maybe using the specific example: 9BA nut and a...
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    Disassembling a keyless chuck

    Thanks. Something could be missing from the drawing, who knows. However... even if the collar was a separate part (which both the drawing and the chuck itself suggest it's not) the balls are still "blindly" captured. Referring to the jaw end as North, on the Albrecht the balls are captured...
  6. C

    Disassembling a keyless chuck

    Hi Any suggestions on how to disassemble a Rohm Spiro keyless chuck? Looking at some web pages and videos (most seem to be for Albrecht chucks), they all begin by removing the thick washer/collar at the back. This Rohm chuck doesn't have a washer/collar there. There are no screws, just holes...
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    The Rohm chuck saga...

    Thanks. I don't really expect it to spin like some other chucks, but I was assuming (maybe wrongly) or at least hoping I could open and close it by rolling my finger over it. You can just see in the video how even with a little bit of pressure my finger or palm sometimes slide over the knurled...
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    The Rohm chuck saga...

    I'm trying to decide whether to return this chuck or not. I'll try to make it short... I bought this Rohm keyless chuck a couple of months ago. It had a problem that a couple of spots in the its range were very resistant, almost like getting stuck, with some force necessary to "climb" over. I...
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    Rohm automatic drill chuck

    I've heard more than a few times that some random Chinese chucks were better than "name" chucks, but it's just a gamble here. No real specs, no specified run out, supplier won't guarantee anything, huge project if you ever want to return anything, etc. I have good experience with a larger...
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    Rohm automatic drill chuck

    I'm also not using 0mm diameter drill bits :D But I'm using very small ones, down to 0.3mm sometimes, but more often in the 0.6mm to 1mm range. I'm going to buy one of those chucks. The question is mainly whether the over twice the cost of the Spiro is worth it. Thanks
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    Rohm automatic drill chuck

    I know some people think Rohm chucks are the worst thing since non-sliced bread... but that seems to be true to any chuck brand that comes up... in that case I recommend continuing to a different thread :) I'm going to buy an automatic Rohm drill chuck (maybe called keyless elsewhere). It's the...
  12. C

    Steel for cooking

    Thank you. Yes I'll go with regular mild steel (I think there's a local equivalent that is similar, they often have different names here than the USA names). I appreciate all the info though I was mainly interested in any health considerations for the type of steel. I've been making pizza for a...
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    Steel for cooking

    Finally some good advice 👻 To clarify... I'd like to get a steel plate for this. I want one that would fit my smaller oven too, none of the commercial ones do (having this shipped from abroad isn't an option). I already have other pizza stones that fit my larger oven. I'll probably have one...
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    Steel for cooking

    Hi I want to get a pizza/baking steel and want it to fit my smaller oven too, can't find anything ready made here. I'm thinking of getting a plate cut to size, but question is what material to use and whether some materials are not good for food. Some places describe baking steels made of "food...
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    Custom made dies and taps

    Thanks very much. Do you have a link to the "head"(?) or holder (I assume chuck-like thing?) that these geometric chasers are used with? Is it something that is available and easy to find? Re the option to what I imagine is basically softening the main stress point when enlarging dies, that is...
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    Custom made dies and taps

    Thanks, I'll look at those places and yes I realized prices are probably very high since I had some similar tools custom made before (but not dies specifically). I'm asking this for a friend who constantly see instruments from a company and time where they apparently used slightly oversized...
  17. C

    Custom made dies and taps

    Hi Does anyone know if there are places that can make dies or taps in specific non-standard sizes from HSS? Dies more than taps, and mainly very small sizes like 2mm to 3mm diameter approximately. This is for musical instrument repair. Sometimes split dies are good enough, sometimes I make...
  18. C

    Making a "helicoil"

    It is done and I did it with threaded nickel-silver inserts. I used the method of putting a screw in them while turning and threading the outside and no problems. I was trying to feel if it would work without... couldn't say for sure. Maybe. I only used medium strength Loctite and even without...
  19. C

    Making a "helicoil"

    David_M that's a very good idea too. If I wasn't half way into making it the other way I would probably do that. Because there isn't enough space I would just have to make the "sex bolt" (I didn't know that's a thing) a little different, with the bottom pressing against the countersink, without...
  20. C

    Making a "helicoil"

    Thanks everyone. I'm going to go with the smaller M3.5 metal inserts and hope it works, using the great method suggested of putting a screw inside while tapping the outside. I have grenadilla wood powder (and make it when I don't), but as mentioned, I had threads fail when I tried this (both...

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