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  1. Replies
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    We tried to machine high temp ceramic parts from...

    We tried to machine high temp ceramic parts from 3/16 diameter finished stock,part of in a lathe then drill several .025" holes through the wall. I put it in a lathe and carbide tooling would not...
  2. Exactly what is difficult about differential...

    Exactly what is difficult about differential pulley ratios?

    I fully realize that you do not know the actual Pitch Diameters, also the Pitch Diameters change as the belts and sheaves wear but this...
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    20 years ago I often received the Nigerian scam...

    20 years ago I often received the Nigerian scam by fax machine, it was a thing of beauty.
  4. Thread: Shop Made Tools

    by Bented
    Replies
    3,533
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    12,059,679

    Sticky: All screw head drive designs were developed for...

    All screw head drive designs were developed for ease of manufacturing.
    As technology evolved it became possible to produce hexagonal socket head fasteners economically which allowed automated...
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    1,593

    It is not possible to compute a spindle speed...

    It is not possible to compute a spindle speed without knowing the turned diameter, turning un-heat treated 4140 I would suggest a cutting speed starting at 350-400 SFM using inserted carbide tooling....
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    Lathe face plate for a large part, the third...

    Lathe face plate for a large part, the third picture is turning the part which is 304 SS.
    Set up and machining on such a part is easily 16 hours or more, a 30" diameter part is running nearly 400...
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    A conical hole? Your description is unclear.

    A conical hole?
    Your description is unclear.
  8. Replies
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    Correct, chatter is the major concern. I often...

    Correct, chatter is the major concern.
    I often turn large diameter yet very thin parts, facing can become a chatter festival if they are not held securely like so.

    Aluminum face plate drilled to...
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    You could turn the major diameter between centers...

    You could turn the major diameter between centers but it would be slow going in order to avoid chatter or the use of a follow rest is required. A majority of the offset portion simply holds the ends...
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    A shaft for something, I am just a machinist so...

    A shaft for something, I am just a machinist so do not need to know what the parts actually do in use so I am not told this information for the most part, make it to the customer drawing is what I...
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    Stepper motor controlled by a crystal oscillator...

    Stepper motor controlled by a crystal oscillator would be a novel approach, there may be prior art however (-:
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    The question is. Why not 68 Deg.? The people...

    The question is.
    Why not 68 Deg.?

    The people that wrote the standard may have simply liked that temperature (-:

    "Hey Fred what temp should we specify?"
    "I find 75 to warm and 60 to cold so...
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    Don't need it in the year 2019 when adjustable 3...

    Don't need it in the year 2019 when adjustable 3 jaw scroll chucks are widely available.
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    There is a reason that such machine chucks have...

    There is a reason that such machine chucks have such aggressive teeth on the jaws, it is difficult to hold the part otherwise. It will push the part right through the 5" spindle bore during such an...
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    The run out amount acceptable is entirely up to...

    The run out amount acceptable is entirely up to you as they are your parts.
    If however you have a concentrcity call out on a Customer Drawing and the customer can measure it a different approach may...
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    19,481

    This is how easy a good conversational control...

    This is how easy a good conversational control can be for simple repetitive jobs.
    The input looks like so for a 1 1/4"-4 TPI acme thread 10 3/8" long.
    0010 The tool change is required otherwise the...
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    If a hdpe container is not relatively clear when...

    If a hdpe container is not relatively clear when holding a dairy product it is likely due to a coating on the inside specific to dairy product production and packaging regulations, it may also be...
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    It is better then 69 Degrees and better then 67...

    It is better then 69 Degrees and better then 67 Degrees, you really should know this (-:
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    The answer is quite simple, use the best machine...

    The answer is quite simple, use the best machine for the job at hand.

    I mostly use two 2 axis CNC lathes with conversational Bridgeport controls to make between 1-50 identical parts, the controls...
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    Make 2500 of the same part and report back on how...

    Make 2500 of the same part and report back on how it went for you (-:
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    Spade drilling is awesome but takes a great deal...

    Spade drilling is awesome but takes a great deal of power and a stout machine. Drill straight through in one shot if possible, inserted spade drills do not enjoy making small holes larger.

    2...
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    How many tool changes do you do per day? I...

    How many tool changes do you do per day?

    I sometimes run 50 or more part jobs that require 4 or more tool changes per part or 400-500 tool changes per 8 hour shift on old Bridgeport/Romi CNC...
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    Push or pull collets?

    Push or pull collets?
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    No need to stone the entire surface just the area...

    No need to stone the entire surface just the area of the ding or burr.
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    You can produce the the back radius and part off...

    You can produce the the back radius and part off but it will leave a nub at the center unless the machine has a sub spindle.
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