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Type: Posts; User: rogertoolmaker

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  1. Replies
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    Cutting speed formula

    The formula for cutting speed for High Speed Steel drills.
    RPM = 4 x the cutting speed / diameter.
    The cutting speed for:
    Low carbon steel = 60
    Brass = 80
    Aluminum ...
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    2,206

    Advancing lead on a screw and nut

    With that fast a lead on a screw of 1/2" dia. I envision a poor end result. Have you considered using a ball screw and ball-nut for the fast lead with a larger diameter screw. Your trying a very fast...
  3. Boring Bar Bushing Material

    It looks like your trying to over engineer. Just use low carbon steel SAE 1020 or better yet 12L17. Using A2 is a waste of high quality heat treatable tool steel. I'll assume if you have A2 in the...
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    Knowledge is passed on from one to another. We...

    Knowledge is passed on from one to another. We aren't born with all knowledge.
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    (1) Compound Blank & Draw Die. (1)stroke (1) Die...

    (1) Compound Blank & Draw Die. (1)stroke
    (1) Die to perf the holes. (1)stroke secondary operation.
    (2) tools and (2) press operations.
    5052H32 Aluminum
    The drawn part will follow the shape...
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    Die with two hits.

    You can make this work with proper gaging. As previously stated form across the grain. It looks like you have all the information to decide what to do.

    Roger
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    I agree that building a die for 100 parts should...

    I agree that building a die for 100 parts should never fly. Unless it is the only way. I am just trying to answer his concerns about a form die. It will help him decide what to do. It all depends on...
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    Form the part in one stroke of the press in one...

    Form the part in one stroke of the press in one station.

    Roger
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    I failed to anwser one of your questions

    Liquid friction is always less than solid friction. When forming use oil by all means. The form radii should be the same as the material thickness or less, but not less than .015 radius. Your 50 ton...
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    I think this what your asking. Mount the form...

    I think this what your asking.
    Mount the form tool in a die set.
    Make two form blocks; each end of the part with a spring pad between the form blocks. As mentioned spring back is a concern....
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    Forming low production formed blank

    The cost of a form die may be prohibitive for limited requirements. The forming could be done with low cost standard press brake tooling.

    Roger
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    Threading calculations

    METHOD 1.
    Finding the hole size size for a thread dia.

    Hole size = Basic Major Dia. of Thread (in.) minus .013 X % of Full Thread / # of Threads per inch. (Use a whole number % of threads). Use...
  13. 38A and 32A Norton Grinding wheels

    Norton wheels are manufactured by crushing stone to size or with individual stone. 32A is made with individual stone and have sharp points that break away presenting fresh sharp points. It will tend...
  14. Try Norton 38A60G8VDB for general purpose. When...

    Try Norton 38A60G8VDB for general purpose. When grinding hardened steel a slightly smaller stone in the grinding wheel works better because there are additional stones doing the cutting. The wheel...
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    You mentioned you were going to abandon your...

    You mentioned you were going to abandon your present supplier. Your supplier is interested in providing the best product to his customers. From your comments he had problems accomplishing that goal....
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    Steel Selection

    I'll take a run at selecting an alloy steel. Have you considered ASTM 52100. The cost will be less than tool steel. Also look at case hardened low carbon steel. The results are a tough inner core...
  17. To get the depth you need grind away the shank to...

    To get the depth you need grind away the shank to clear just above the thread.
  18. Toolbits

    I have been grinding H.S.S. tool bits on a bench grinder for the last 69 years. It's a matter developing skills. If a special shape is required that cannot be fashioned on the bench grinder; use the...
  19. Since your new to the lathe: The only way to do...

    Since your new to the lathe: The only way to do this is to cut 2" at a time with a center and move the work out of the chuck 2" more and repeat until you have cut the full length of the work. Then...
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    Steel for arbor

    I'm with you 12L17! Why spend the extra for material when the part does not require heat treatment? The quality of the product will not improve by using a better steel. Quality should be good enough...
  21. Reoving oil

    Have you thought of dish washing detergent if your degreaser idea doesn't work? Some oils will not be removed with a degreaser. A detergent in warm water will take all oils.

    Roger
  22. hardened washers

    My first thought, do the washers really need to be harden? Second though is a commercial hardened washer is not so hard that it can be machined to size in the lathe.

    Roger
  23. 6061 Aluminum

    6061 Aluminum is not the best for milling. Its used for extrusion, is mealy and tends to stick to the cutter regardless how the cutter is sharpened. Try reducing the RPM of the cutter while ramping....
  24. Your receiving good general advise. And I would...

    Your receiving good general advise. And I would suggest that you use Norton wheels and not jump from one supplier to another. I am retired and have spent many years in front of a surface grinder...
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    .corection to post

    Carbon content should be ,10 to .18 percent carbon.

    Roger
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