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Recent content by GTMule

  1. GTMule

    4340 cracking dhuring h/t

    insulating material like.....a bolt? or?
  2. GTMule

    4340 cracking dhuring h/t

    The drawing specified: Heat treat per ASM-6875 TO 180-200ksi, Rc 40-42, IIRC. The problem is that the machine shop that is making the part got it heat treated out of house, so he doesn't know the exact process. It's one of those "job shop" parts, so he'll have to get it right eventually to...
  3. GTMule

    4340 cracking dhuring h/t

    Hey everyone, We've got a rather large 4340 part that is cracking at some point during heat treatment. All the work is being done out of house, and I assume the heat treater never noticed the cracks (though I can't IMAGINE how not) Print speced 180-200ksi Link below with some pictures. For...
  4. GTMule

    Hardenable stainless?

    I think you'll find the cost of any 3" 17-4 Stainless is going to way outweigh any process savings. I'd figure on 8-10X the material cost, Precip hardening the 17-4 might cost the same or a little more than carburizing the CRS. Machining is going to be WAY more, and all you'll save on is...
  5. GTMule

    Flywheel Heat treat/Material

    It's a metallic racing clutch. It will see VERY little slip=> little heat. It'l be revved quite high, though (~10k rpm), so I'm trying to get the burst strength up. Also, yes, the friction face will be ground afterwards. I decided to go with Rc-35 to 409 before reading your post, now I feel...
  6. GTMule

    Flywheel Heat treat/Material

    Sorry for the X-post, I wasn't in the forum I thought I was when I first posted. Anyway, the section thickness is never more than about .4", being a lightweight flywheel, it changes a good bit. I'm thinking it'l be treated, then the firction surface ground afterwards.....? so mabye specify...
  7. GTMule

    Steel Flywheel

    I'm having a custom flywheel machined, and I wanted to know what heat treat specs you all think I should be shooting for. It'l be made of 4140, unless anyone can give me a reason I should step up and use 4340 ($). I'm thinking I want a through heat treat, on the order of rc45, comments...
  8. GTMule

    Flywheel Heat treat/Material

    Hey everyone. I'm having a custom flywheel machined, and I wanted to know what heat treat specs you all think I should be shooting for. It'l be made of 4140, unless anyone can give me a reason I should step up and use 4340 ($). I'm thinking I want a through heat treat, on the order of rc45...
  9. GTMule

    A-Arm material

    well, I'm talking about some lathe turned parts that will be welded to some 4130 tube on a fixture. It'd then get normalized afterwords, as opposed to heat treated. I was wondering why parts in a weldment would be pre-hard.
  10. GTMule

    A-Arm material

    Is there any possible reason to use 4140 pre-hard to make the machined parts (that the spechrcals mount into) on a set of racecar A-arms. The parts will be normalized, but not heat treated, I can't see how theyr'ed be ANY reason to use pre-hard, with the welding and normalizing. The prints...
  11. GTMule

    Cosmoss FlowWorks Question (should be basic)

    What am I missing. I'm using Cosmos flowworks for submerged bodies (actually, race cars in ground effect), and I can find no way to get answers for Cp and the like. What gives? Also, I get different drag (or lift) numbers when looking at the goals, and the reports. I'm pretty good with the...
  12. GTMule

    multi piston calipers

    Generally, as far as I know, the different diameters are only to help reduce uneven pad wear. In other workds, the smaller diameter piston recudes pressure on that end of the pad, which, for several reasons, helps the pad wear more evenly. You'll find plenty of racing brake setups, even 8...
  13. GTMule

    Sworks '04

    Yep, I've modelled about the whole Auroura product line, throughout my modelling of an entire race car. the trick to making it go together well, is have the origin at the center of rotation an all the parts in the assembly (rod-end, race, and bearing, depending on how you model it) just just...
  14. GTMule

    Cosmos DesignStar

    Hey guys, This is a LITTLE off topic, but though the SW forum would be the best palce to tackle it, since I couldn't find a cosmos forum of any kind and theyr'e quite similar in interface design (intentionally). I've been playing around with running external flow simulations in COSMOS...
  15. GTMule

    MAzda 13B-12A Drawings/model

    Hi everyone, I've been assigned the take of designing a bellhousing for a mazda rotary (12A) engine in a project at work. I was wondering if anyone had, at the least, a drawing of the rear mounting face of a mazda rotary engine. Also VERY helpful would be dimensional data for other parts of...
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