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  1. rat_stomper

    O T Shop Stereo

    I have one of these at home and I think it works great. Dayton Audio DTA-PRO
  2. rat_stomper

    7/8-20 & 1.5-16 threaded arbors came with my new Clausing 8520 - what are they for?

    Probably for a boring head or something like that.
  3. rat_stomper

    Cryo Drill Bits

    We tried some once mainly in 304 and 316L, I wasn't very impressed for the price and I swear they were more brittle than normal M42 drills.
  4. rat_stomper

    1700 degrees F hot enough for A2 Heat Treatment?

    good god he didn't ask for the heat treatment procedure, he asked if 1700F was close enough. I don't have enough experience to give a good answer, but my gut says no simply because it's out of spec.
  5. rat_stomper

    Cutter advice wanted

    The HSS cutters will basically be as hard as usable when you get them (unless the manufacturer sucks). Even if they could be made harder, it's well beyond what you can achieve with a torch; if anything they will come out softer.
  6. rat_stomper

    How to drill a large hole in steel without a mill

    The RPM is pretty high, but manageable; worst case a hand drill in low will work with what I'm linking to. Check these out McMaster-Carr, I've had great luck with them...you'll also need the correct arbor.
  7. rat_stomper

    Work holding for large irregular shaped items (Intake manifold) on smaller mill.

    I like that idea, how big of a sniff are you planning on?
  8. rat_stomper

    Need help finding silver solder

    I think McMcaster-Carr 7676A7 is basically what you want; 45% silver, with cadmium but 3/64" vs 1/32".
  9. rat_stomper

    Bond ultem 1000/PEI?

    I would suggest give Ellsworth Adhesives a call, if it can be glued they will know what you need and how to use it.
  10. rat_stomper

    will this wiring scheme for 40 HP RPC work?

    So you want to be able to run both single and three phase loads off the same panel? If that's the case, no you really need to have a single phase panel and a 3 phase panel for the RPC output. What the manufacturer shows has is better because the connected loads will always get proper 3 phase...
  11. rat_stomper

    will this wiring scheme for 40 HP RPC work?

    So you want to bring single phase into a 3 phase panel on say L1 and L2, then supply the RPC with a 100A breaker connected to L1 and L2 and connect the generated leg back to L3; am I reading that right? I can't see an obvious reason why it wouldn't work....may not be code compliant.
  12. rat_stomper

    Is there a Stevco or other Relay that is socket mount ?

    I think it's inside the operating envelope, but yes you would need to control a separate contactor with it. Set voltage: 150-240 Release voltage: 140-230 It's just watching the generated leg to drop out the start cap or pony motor right? I've never built an RPC so please enlighten me if I'm...
  13. rat_stomper

    Is there a Stevco or other Relay that is socket mount ?

    Omron makes octal base, voltage sensing relays; the LG2-AB should be the right series. But they are very proud of them, they run around $200.
  14. rat_stomper

    Strange sandpaper type?

    They are apparently still aluminum oxide, but it's formed into pyramid shapes instead of randomly shaped. We can get a near mirror finish from them. We use these...
  15. rat_stomper

    Strange sandpaper type?

    Sounds like 3M Trizact to me. We use it on belts sanders for polishing stainless steel pipe.
  16. rat_stomper

    OT: Charging two batteries in parallel

    You could use a diode isolator to charge both batteries while preventing them from discharging into each other. I did it on my buddy's boat so that the "cranking" battery couldn't discharge into the "accessory" battery.
  17. rat_stomper

    Tapping Straight Holes With a Hand Drill

    I totally understand the cosmetic reasons, most of my work is on handrail parts so I feel your pain...in that case I would agree that as may others have said, some sort of drilling and tapping guides would be the best approach. If you could identify the guys that have issues getting the hole...
  18. rat_stomper

    Tapping Straight Holes With a Hand Drill

    Not to reinvent your wheel, but have you considered using "rivet nuts" instead of drilling and tapping the hole? They work pretty well in thin materials.
  19. rat_stomper

    Threading PETG rod plastic (3d-printed)

    I 3D print a lot of PETG and I can tell you it's not very thread friendly. As you have noticed it's very soft, and has a low deflection temperature. All you can do is go slow and put something slick on it, PETG is pretty chemical resistant so WD-40 or mineral oil will help. The easiest thing...
  20. rat_stomper

    Non-circular boring. Nerd fun.

    skunkworks, can you please elaborate on your Pi4 setup? I've been playing with the idea of using one in a small CNC router I have, but didn't know if it was feasible or where to start.

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