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Recent content by juergenwt
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J
Tapping 8mm x 1.25 help
As said before: Check if you are not using a 5/16-18 screw. -
J
metric studs
If it calls for M10 than it is always coarse!!! If something other than coarse was wanted than it would be called for (M10x1.25 or M10x1) https://www.carrlane.com/engineering-resources/technical-information/design-standards-and-engineering-information/inch-and-metric-thread-standards -
J
Preferred interference? Steel pins into 6061.
You use a 5H7 reamer (standard). The pin should be 5r6 or 5s6 for a light press. For a lighter push fit use pin 5n6. 5m6 ist the standard for dowel pin fit (sliding) DIN 7157 PS.: Stay with a standard hole size like 5H7 for cheaper and available reamers. For the desired fit you adjust your pin... -
J
Looking for resources on learning to make stamping dies
Pinch trimming looks like one way to go. Also-Try to find out how they make those hollow rivets They make them by the millions. Looks to me like they use tubing, cut to length and than form the head with a simple forming punch with the correct pilot size while holding the part in a simple... -
J
OT: Some fastener sizes on chevy truck are best fitted with metric socket sizes.
Sewing machines have their own threads. Zillions of them from different manufacturers. -
J
Taps meaure oversize
What is the marking on the tap? Some taps are made oversize to be used in parts made from CRS like 1018 that is being case hardened. Case hardening CRS closes the hole. How much depends on the amount of case. -
J
How to turn/grind between centers with deliberate small eccentricity?
If you want to make it "Gauge" quality you will have to do it the way I said. Otherwise you will never get past any inspection department. You will also need a Jigbore and a precission (tool and die maker grade} V-block. All other methods are for back alley shops and not to be used when it... -
J
Fit Callouts for Dowel Holes
If we have people representing the state of US manufacturing on this Machinist forum who think ISO is a secret society and that ISO Tolerancing is some kind of a secret code - than god help us. I can only assume they are in it for the enjoyment of making an argument. Well have fun...- juergenwt
- Post #41
- Forum: CNC Machining
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J
Fit Callouts for Dowel Holes
Answer: Undercut as per DIN 509 Type E 6 Designation Designation of a type E undercut, with a radius, r, of 0,2 mm and a depth, t1, of 0,3 mm: Undercut DIN 509 – E 0,2 * 0,3 Look up DIN 509 Type E Download the PDF, than watch the video...- juergenwt
- Post #34
- Forum: CNC Machining
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J
Fit Callouts for Dowel Holes
If your customer can work to your prints than that is just fine, But we live in a global economy and if you sent your print anywhere else than be prepare to answer a lot of questions and get a lot of "NO QUOTES'. If you put notes on a print that may make sense to someone in the US do not assume...- juergenwt
- Post #32
- Forum: CNC Machining
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J
Fit Callouts for Dowel Holes
Thank you implmex for your thoughtful post. Unfortunately our world of manufacturing will not work with designations like light sliding fit or tight press fit or easy push fit. Something like it may work in a small shop environment ,for in shop use or on a local level but not in large...- juergenwt
- Post #29
- Forum: CNC Machining
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J
Fit Callouts for Dowel Holes
Well hello Seymour. Known you for many years. Thanks for your many wise and helpful posts. You are a real technical genius, We can learn so much from you. Don't forget to bring plenty barley corns to your shop.- juergenwt
- Post #27
- Forum: CNC Machining
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J
Fit Callouts for Dowel Holes
You need to study ISO 286 System of tolerances.In use wherever ISO is used in manufacturing. Samle Pin 12m6 = 12 +7/+18 . m6 tol. requires ground finish on pin Hole 12H7 = 0/+11 . H7 tol. can be held with reamed finish. Result can be anywhere from a sliding fit to a light press...- juergenwt
- Post #24
- Forum: CNC Machining
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J
Fit Callouts for Dowel Holes
Prefered for Machinist, Tool and Die Makers or other close tol. work: Dowel Pin m6, Hole size (Reamer) H7 Sample: 12m6 (pin) , 12H7 {Reamer, Hole) This will be ok for most applications needing a sliding fit or light tap fit. For a tight or tighter fit use a dowel m6 and a reamer P7. Sample...- juergenwt
- Post #22
- Forum: CNC Machining
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J
6-32 Taps...what did I do wrong?
For stainless steel you use 50 % thread. For 6-32 use .116 drill #32 https://www.bestmaterials.com/images/Thread_Drill_%20Chart.htm https://www.bestmaterials.com/images/Thread_Drill_ Chart.htm