Search:

Type: Posts; User: djc

Page 1 of 13 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    32
    Views
    1,872

    I am quite sure you did not mean to type Airy...

    I am quite sure you did not mean to type Airy points and that your software has done a spurious auto-correct from the Bessel points that you actually typed.
    ...
  2. Replies
    216
    Views
    29,853

    May I respectfully suggest that you glance at the...

    May I respectfully suggest that you glance at the comments made by Richard Feynman in the Rogers Commission report on the Space Shuttle
    ...
  3. Replies
    216
    Views
    29,853

    Is there any utility in relieving the non-driven...

    Is there any utility in relieving the non-driven side of this? I am thinking it would prevent you accidently trying to start the engine in reverse if the drill happens to be going in the wrong...
  4. Replies
    13
    Views
    625

    There's a very interesting video by Dan Gelbart...

    There's a very interesting video by Dan Gelbart where he explains why solvent washing is not such a good thing and detergent washing is very good. Worth looking at.
  5. Thread: Sine Bar Sled

    by djc
    Replies
    5
    Views
    385

    I am trying to think this through but how...

    I am trying to think this through but how important is it that the edge of the sine bar be vertical (or the shelf of the holder be horizontal)? Do you need to use a square sitting on the cross slide...
  6. Replies
    13
    Views
    561

    If you need it thicker, cut another piece, slit...

    If you need it thicker, cut another piece, slit it longways and remove some until it goes tight inside the first. Cement into place and you have 1" wall thickness. Does not need to be full length....
  7. Replies
    33
    Views
    2,178

    I think there is a company called JFK Products or...

    I think there is a company called JFK Products or JFK Precision who sell 4 1/2 Morse to 5C adaptors.
  8. Thread: M25 x 0.75 thread

    by djc
    Replies
    16
    Views
    1,041

    That is a very fine pitch on a very large...

    That is a very fine pitch on a very large diameter. Very roughly 32 tpi on 1 inch.

    Using a die to cut this thread may be difficult. You might need to turn the beginning of the stock to the root...
  9. Replies
    13
    Views
    854

    Why do think this? In buildings, the beams are...

    Why do think this? In buildings, the beams are very often precambered upwards so that as the dead and live loads are applied, the precamber drops out and they become level.

    Even if stiffened, the...
  10. Replies
    13
    Views
    854

    But by application of a point load midspan, you...

    But by application of a point load midspan, you are likely to get a pronounced bend at that point rather than a more graceful curve the full length of the pole.

    If you have the kit, imagine making...
  11. Replies
    63
    Views
    5,816

    Are you sure on this? Could you please give an...

    Are you sure on this? Could you please give an example.

    Seems to me the engineering challenges of making this work with acceptable tolerances for any kind of mass production are rather daunting.
    ...
  12. Thread: Blasting

    by djc
    Replies
    17
    Views
    1,861

    Anything with a hole in it, thread onto a piece...

    Anything with a hole in it, thread onto a piece of wire.
  13. Replies
    22
    Views
    1,362

    It was your post that prompted my question. It is...

    It was your post that prompted my question. It is only when you helpfully draw it that you see the issue.

    Try it and see... If your ellipse is ten units wide and two units tall, and you offset by...
  14. Replies
    24
    Views
    1,882

    Have a good think of your sequence of operations....

    Have a good think of your sequence of operations. A single-wheel knurl puts a lot of sideways thrust on the part and spindle. So use it as close to the chuck jaws as possible. I am not sure that...
  15. Replies
    22
    Views
    1,362

    Slightly peripheral to the original question, but...

    Slightly peripheral to the original question, but what is the correct terminology for what we are trying to achieve here?

    We have used the term 'concentric'. This is not enough as you could draw...
  16. Replies
    22
    Views
    1,362

    Google ellipsograph and look at the images. There...

    Google ellipsograph and look at the images. There are a number of ways of drawing an ellipse whereby the mechanism sits outside the drawn figure.
    ...
  17. Replies
    22
    Views
    1,362

    Make one from plywood to the smallest size the...

    Make one from plywood to the smallest size the guide will do. Use this to make a female of the same size using a bearing-guided bit. Use a larger bearing running inside the female template to make a...
  18. Replies
    20
    Views
    988

    Plenty available. Cheap one at the moment: ...

    Plenty available. Cheap one at the moment:

    https://www.ffx.co.uk/tools/product/Faithfull-FAIWBC80S-5023969258669-Wire-Cup-Brush-80-x-M14-x-2-Stainless-Steel-0.30mm

    If I were you, I would snip...
  19. Replies
    47
    Views
    3,806

    And do this as the first operation on the worn...

    And do this as the first operation on the worn out drill, holding it by the flutes or parallel part of the shank. Then reverse it and cut down its length.
  20. Replies
    47
    Views
    3,806

    This may be a crazy suggestion, but if you want...

    This may be a crazy suggestion, but if you want to keep the endmill with the holder, just loctite it into the collet. Spare MT3 collets must be cheaper than material plus time to make bespoke...
  21. Thread: Is this safe?

    by djc
    Replies
    10
    Views
    1,547

    Can I go against the grain here? The joiner nut...

    Can I go against the grain here? The joiner nut is a perfectly suitable starting place for your idea.

    The spindle rotation has a tightening effect on everything so no pins, loctite, etc. required....
  22. Replies
    13
    Views
    848

    Do they rotate relative to the shaft? Or is there...

    Do they rotate relative to the shaft? Or is there anything that by design prevents them from rotating? If not, put a wrap of bicycle inner tube around them and grip with stilsons. Once you get them...
  23. Sorry, I missed one. Pointor by Ransen Software....

    Sorry, I missed one. Pointor by Ransen Software. The author of this one was willing to consider making (i.e my employer paying him to make) a customised version more suited to our needs so that might...
  24. Have a look at a program called RapidDXF. This is...

    Have a look at a program called RapidDXF. This is less than automated inasfar as you have to open RapidDXF, select your input .XLS file and name your output file.

    Alternatively, dxfwrite (and its...
  25. Replies
    11
    Views
    1,080

    But is this not simply due to the way you are...

    But is this not simply due to the way you are defining 'error'? You seem to be defining it as a linear distance per thread. Hence, for a thread whose pitch is twice the unit or base pitch, the linear...
Results 1 to 25 of 317
Page 1 of 13 1 2 3 4