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  1. tharding247365

    What is the positional tolerance of this slot?

    I see this a lot on drawings. This part has no GD&T applied to it, therefore our Sheet Tolerances apply. Dimensions 30 & 50 are centered on the centerline of the part. Do we assume the size tolerance IS ALSO the position tolerance, to sheet tolerance. Do we assume there is "Implied...
  2. tharding247365

    Best 2 Materials for Wear Resistance and Coefficient of Friction?

    Anybody have best recommendations for a slippery surface with the lowest wear rate? Examples: Teflon on plastic Hard Anodized Aluminum on Teflon Hard Anodized on plastic This will be sliding wear. One will ride over the other.
  3. tharding247365

    Recommend a plasma cutter table

    Looking for a plasma cutter to cut 3mm aluminum panels. Looking for high resolution accurate cuts. Anybody have recommendations on a plasma cutter table? Want to use one with a hypertherm cutter. A fiber laser would probably more suitable for this but they're too expensive.
  4. tharding247365

    Recommendations Fiber Laser Cutting Machines?

    Looking to invest in a fairly small laser cutting machine. We want to cut through 3mm thick aluminum. Any brand recommendations? Fiber Laser cutters seem to be the way to go, just not sure what machine to be looking at. Cheaper the better, as these don't look cheap.
  5. tharding247365

    Rectangular Hole GDT

    Is this legit? I can see what this is trying to accomplish, but is there a better way to do this or is this fine? I was under the impression you can only use diametrical callouts on a circular feature.
  6. tharding247365

    How to optimize press fits?

    We press 2 round shafts together. One piece stainless, the other ceramic. We require a specific pull force, and as of now we sometimes get good parts and sometimes bad parts. Parts are not large, they're about half an inch big. Are there are things to consider when trying to achieve a...
  7. tharding247365

    Thermocouple Values Fluctuating? Lots of noise.

    First thing, I'm not an electrical guy, but I'm trying to figure this out. I have 2 Type T thermocouples. One connected to an Omega USB-UTC that is connected to a laptop, the other connected to a Heater Controller that uses a PID controller Both of these thermocouples connectors are fastened...
  8. tharding247365

    Recommendations on Inspection Software?

    We've tried the Solidworks Inspector package. We HATE it. It is so buggy, and doesn't do basic things that we'd like to do. We've called Tech Support numerous times and have gotten the "This is a known issue" lingo. We're pretty much done with this one. QA-CAD located here looks promising...
  9. tharding247365

    Anyone use DimXpert in Solidworks?

    I've been assigned to start MBD (Model Based Definition) our models, for tolerance analysis', and possibly use the MBD to carry over into drawings. This is not the actual Solidworks MBD package, just the DimXpert that's built into Solidworks. As quirky as trying to dimension parts in the model...
  10. tharding247365

    Diametrical Position on a Square or Rectangular hole

    Would it be acceptable to use a diametrical position call-out on a square feature? Trying to use a circular tolerance zone to control this, but I read somewhere you can only use the diametrical call-out on a circular feature? Can anybody explain this in detail?
  11. tharding247365

    Staking Tool Material for Steel Parts

    What material do people use for Impact Staking steel parts? We used some 4140 and the part wears pretty quickly. It was quenched and tempered to 46HRC. We used some S7 also, quenched and tempered to 46HRC and that wore out even faster. Suggestions? I'm thinking 300m but I thought maybe there...
  12. tharding247365

    Hole Saw for Rubber Stopper?

    Any suggestions to drill about a 3/4" hole through a rubber stopper? I'm thinking a really fine tooth one, but I haven't done this before. About a 2" deep hole.
  13. tharding247365

    Advice on Machining Nylon 11?

    The part is about 3" OD 6061-T6 that is also fairly hollow. This will be coated in Nylon 11. I require tolerances of plus-minus .0005. Reason for this tolerance, guaranteed interference fit. Obviously, they can't coat to that spec. I now need to rely on machining the nylon. It's a coating...
  14. tharding247365

    Calling All CMM Operators

    Long story short, we only have 1 person in the company that knows how to program and use the CMM. This is frustrating because when we have conflicting results, there is nobody else to bounce ideas off of, and double check results. There was a recent conflict about CMM vs Bench Checking parts...
  15. tharding247365

    Help with Simple GDT Question

    I'll make this brief. Goal: Both Cross-holes to be centered to each other Axis of the Cross-holes to be centered, controlling both X and Y component in relation to Datum E. The Y component is more critical to control than the X component. What I have so far: Datums A & B True Position to each...
  16. tharding247365

    Help on Calculating Flange Stress?

    This is not for sealing purposes. This is purely for transmitting torque. I've designed an Aluminum Flange that bolts onto the back of a steel rear differential flange. How would I go about calculating stresses purely from the bolt preload, thermal preloads in extreme conditions, and also in...
  17. tharding247365

    6061-T6 Forging, can we get a reflective finish?

    Looking for a post process operation such as tumbling, sand blasting, etc to get a more uniform and hopefully reflective finish on some forgings, so we can anodize after and have a really nice looking part without finish machining. Trying to make look as good as actually machining, or close to...
  18. tharding247365

    Material for Fixturing 4140 Parts?

    Any advice for a specific material recommended to hold crossholes accurate to one another? I was thinking of making a tube with a very accurate OD of about 1.2505" and leaving the ID unmachined. It would be 3-4" long and installed like a pin in before heat treat to prevent distortion. I would...
  19. tharding247365

    4140 Possible Distortion Quench/Temper?

    Long story short, making a tube with internal splines, and some other geometry on one end. I require a hardness of about 52HRC through hardened for it's mechnical proerpties, just hoping it won't be too brittle. For the broach to go through the part cannot be any harder than 32HRC. My plan was...

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