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  • Users: rsm7400
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  1. rsm7400

    Composite Profile

    I have a SR machined into the top of a block. The bottom is datum A, the long side datum B and the short side datum C. Basic dimensions are given from each of these faces. We have profile of .020 but want to refine the shape to be within .005 For a composite tolerance I know the top line...
  2. rsm7400

    Uneven suspended load/counterbalance

    I'm sure this question is easy but I do not remember my statics calculations right now haha. I have a beam that is 79" long and weighs 130lbs. I have a part that weighs 190lbs that will be uniformly suspended by 2 straps 44" apart. The first strap needs to be hooked on the bar started at 4". I...
  3. rsm7400

    Localized Datums in a print with patterns

    I have large rectangular part with several identical patterns in different locations with datums called out to the main part and some features to the localized pattern. See the mockup sketch attached, these are not my actual features but mimic what I am seeing. Yes I know I didnt draw all the...
  4. rsm7400

    Machining of Silicon Nitride

    Anyone out there have familiarity with grinding Si3N4? We do some work with it and are able to do a lot of grinding in the unfired state, but in the fired state we tend to eat up tools very fast. I know this stuff is tough to machine but not sure why we break so many tools...
  5. rsm7400

    Need help identifying old resistor

    I have an old resister that blew in a piece of equipment that I need help identifying. It is not like normal resistors that I work with. This is exactly what is written on it: 1.02K CLARO RN70B 1021F CMF 1% Can someone tell me what I am looking at? I know 1.02kOhms, and I'm guessing 1%...
  6. rsm7400

    Profile Applied to Slotted Hole

    Attached is a quick drawing I have for a part we are working on. With a profile of .001 applied to the .071 feature and a MMC bonus on datum A what is the min and max of my .071 feature? My interpretation was that I get a ± .0005 band around the slot. Meaning the slot can be .070 to .072 in...
  7. rsm7400

    Percent Thread Called Out on Print

    Good morning Eng Tips Community. I have a print that is calling out a thread as listed below: M3 x 0.5 Thru 55% Thread What does the 55% thread mean? This is the first time I have seen this on my 1000's of unique part numbers. Thanks ________________________________ Ryan M Quality...
  8. rsm7400

    Positional Tolerancing Boundary Concept Angled Slot

    Im a little stuck on this one. I have some slots with a true position of .001 on the width but .004 on the length. The slots are at angles offset from a series of holes. The holes also have a true position which was easy to check - Using polar coordinates the holes were checked to the basic...
  9. rsm7400

    White Light Interferometry

    Good morning Eng Tips Community. I am in desperate need of a company with interferometry or white light interferometry. If anyone knows of a place that rents any type please let me know. I am also seeking a company in the North East that we could do contract measurement (small qtys) or see if...
  10. rsm7400

    Flatness Callout Question

    Good afternoon all. I have a new print with a callout I am unfamiliar with. It is a rectangular plate with the following callout tied to the thickness I am unfamiliar with the TOT. All I can think of is Total Over Thickness? Not really sure. ________________________________ Ryan M...
  11. rsm7400

    Carbide Thread Gages

    Does anyone know where I can find carbide thread gages? Anyone I have used in the past is a no quote now. Carbide is very important to us. Our technical ceramics are so abrasive that we get very little use out of a standard thread gage before it is junk. Like 50-maybe 100 uses before it is...
  12. rsm7400

    Flatness Callout Question

    I have never seen flatness this way on any of my prints. I assume it means a flatness of .0010 across the entire area and no worse of a flatness of .0005 in a 1mm x 1mm area? Yes the print is in metric. Any help on interpretation? Thanks! ________________________________ Ryan M Quality...
  13. rsm7400

    Thread gage prints/tolerance tables

    I am having someone try to make a thread gage out of a special material due to property requirements. Are there prints for thread gages or just tolerance tables? I also prefer my gages to be reversible style and not taperlock style. Example a 2-56 2B thread, where would I find a print of all...
  14. rsm7400

    QC Lab services in the North East

    Does anyone have any recommendations of where I can get some really highend measurement performed? I would like to verify some results of a few products but need a place that can measure them. The first thing I need to measure is flatness to 2 lightbands (.000024") on parts that can vary from...
  15. rsm7400

    Tight Flatness Condition

    I am having an increased need for tighter flatness specs. Currently I have quite a few parts that are within 50 millionths flatness. I have been able to successfully measure these with an optical flat, but only when the surface finish is really good. I have a new part coming that needs to be...
  16. rsm7400

    Basic Vision Measurement System

    Currently in my plant I have over a 1000 measuring tools on a strict calibration and repair schedule. 4 of those tools are Micro Vu Vector V-260 that use a Q-16 DRO for X,Y and some basic functions (radius, angles, etc). I am looking for a "new" one for the floor. I just dont know if there are...
  17. rsm7400

    Go/ NoGo TIR gage?

    I am looking for a gage that I can use for a very fast sort with my operators. Part gets located between two conical centers and has a dial indicator that rests on a hub on the outside of the part. We spin the part and you look for the Total Indicator Runout to be less than .030" This is eating...
  18. rsm7400

    Calibration of Torque Wrenches

    We recently had our AS9100 audit and something came out of it that we didn’t expect. Torque wrenches not calibrated. Now granted, we only use them to tighten machining fixtures on certain CNC jobs but we were still told they needed to be calibrated. I have no idea what sizes of torque wrenches...
  19. rsm7400

    cheating the cpk

    Hello. Thanks for any useful information in advance! Background info: My questions are related to a thin part that is produced, but then gets a coating on it. the parts are made to .040" +/- .0005" and then coated with a final spec of .042" +/- .001" and a cpk>1.33 the spec on the coating is...
  20. rsm7400

    In process statistics help

    We are a custom job shop with thousands of part numbers that rotate in and out over several years. Some products we might make 50 of in a year others we might make 1000s. I would like to implement some SPC to the floor to help reduce the amount of scrap that makes it to inspection. I am trying...

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