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  • djc's Avatar
    08-16-2019, 02:08 AM
    djc replied to a thread The Holy Relic of Flat in General
    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...
    32 replies | 1829 view(s)
  • djc's Avatar
    08-14-2019, 02:19 AM
    djc replied to a thread Vertical hit and miss engine in General
    May I respectfully suggest that you glance at the comments made by Richard Feynman in the Rogers Commission report on the Space Shuttle ...
    212 replies | 23463 view(s)
  • djc's Avatar
    08-13-2019, 12:18 PM
    djc replied to a thread Vertical hit and miss engine in General
    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...
    212 replies | 23463 view(s)
  • djc's Avatar
    08-13-2019, 02:13 AM
    djc replied to a thread shars 10 inch 4 jaw D1-6 chuck in General
    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....
    13 replies | 582 view(s)
  • djc's Avatar
    08-10-2019, 02:21 AM
    djc replied to a thread Sine Bar Sled in General
    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...
    5 replies | 374 view(s)
  • djc's Avatar
    08-07-2019, 01:37 PM
    djc replied to a thread PVC or Poly Pipe or Rings ? in General
    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"...
    13 replies | 552 view(s)
  • djc's Avatar
    07-28-2019, 02:40 AM
    djc replied to a thread 5C collet for lathe in General
    I think there is a company called JFK Products or JFK Precision who sell 4 1/2 Morse to 5C adaptors.
    33 replies | 2106 view(s)
  • djc's Avatar
    07-20-2019, 04:42 AM
    djc replied to a thread M25 x 0.75 thread in General
    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...
    16 replies | 1036 view(s)
  • djc's Avatar
    07-13-2019, 09:22 AM
    djc replied to a thread Bending a Scaffold Pole in General
    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...
    13 replies | 846 view(s)
  • djc's Avatar
    07-13-2019, 02:32 AM
    djc replied to a thread Bending a Scaffold Pole in General
    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...
    13 replies | 846 view(s)
  • djc's Avatar
    07-07-2019, 04:00 AM
    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...
    63 replies | 5439 view(s)
  • djc's Avatar
    07-04-2019, 02:02 PM
    djc replied to a thread Blasting in General
    Anything with a hole in it, thread onto a piece of wire.
    17 replies | 1593 view(s)
  • djc's Avatar
    07-03-2019, 02:58 AM
    djc replied to a thread defining an ellipse in General
    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...
    22 replies | 1349 view(s)
  • djc's Avatar
    07-03-2019, 02:29 AM
    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...
    24 replies | 1869 view(s)
  • djc's Avatar
    07-02-2019, 02:25 AM
    djc replied to a thread defining an ellipse in General
    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...
    22 replies | 1349 view(s)
  • djc's Avatar
    07-01-2019, 02:03 AM
    djc replied to a thread defining an ellipse in General
    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. ...
    22 replies | 1349 view(s)
  • djc's Avatar
    07-01-2019, 01:50 AM
    djc replied to a thread defining an ellipse in General
    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...
    22 replies | 1349 view(s)
  • djc's Avatar
    06-30-2019, 03:06 PM
    djc replied to a thread Stainless for outdoors in UK in General
    Plenty available. Cheap one at the moment: ...
    20 replies | 973 view(s)
  • djc's Avatar
    06-30-2019, 02:54 PM
    djc replied to a thread Shortened Morse Tapers in General
    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...
    45 replies | 3189 view(s)
  • djc's Avatar
    06-30-2019, 02:50 AM
    djc replied to a thread Shortened Morse Tapers in General
    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...
    45 replies | 3189 view(s)
  • djc's Avatar
    06-29-2019, 02:18 AM
    djc replied to a thread Is this safe? in General
    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...
    10 replies | 1541 view(s)
  • djc's Avatar
    06-29-2019, 02:05 AM
    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...
    13 replies | 840 view(s)
  • djc's Avatar
    06-26-2019, 01:37 PM
    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...
    24 replies | 1324 view(s)
  • djc's Avatar
    06-26-2019, 01:12 PM
    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...
    24 replies | 1324 view(s)
  • djc's Avatar
    06-08-2019, 03:50 PM
    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...
    11 replies | 1076 view(s)
  • djc's Avatar
    06-05-2019, 01:46 PM
    Could I say most respectfully that you are proceeding about this problem in the wrong way. You do not require a gear train calculator; you need a...
    11 replies | 1076 view(s)
  • djc's Avatar
    06-01-2019, 01:26 PM
    Put the handle back in using adjacent hole and pin 50. Find 200lb gorilla or svelte wife or small child to hold onto it to counteract torque. Use...
    7 replies | 470 view(s)
  • djc's Avatar
    05-24-2019, 02:40 PM
    A standard two-channel encoder will work. It has A and B channels and power and ground. Perhaps you could give examples of the variations you have...
    7 replies | 665 view(s)
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