No announcement yet.

Order of operations

  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    Peter S. Doesn't all the blood when you get your thumb and finger tangled up in the sharp cutter make it difficult to see the scribed lines?
    Jim H.


    • #17
      John S.
      Having seen your yummy shop I am wondering why you do not just make the insert equipt countersink that you want using the CNC mill to cut insert pocket out of a suitable chunk of 4140 or what not.

      I have no doubts as to your abilities to make your own, but I do understand finding time can be a problem too.

      Just a suggestion.

      BTW - just seen the latest ME (#4165) - love the rotory motors and that minature ML-7 Myford!


      • #18
        Now I have seen just what they are That's what I will do. Sometimes a photo isn't good enough to get the relationship of angles but this puppy has none. It's just dead square on the centreline. All the rake / clearance is provided by the insert.
        Not sure what 4140 is in our terms but material cost doesn't come into it for something this size. A foot of O1 is only about $15.
        I also get the chance to machine the shank as a three lobe drive to prevent slipping.
        As you say it's time.

        Not seen the latest ME as I stopped having it a year ago. I thought it has gone downhill to the point where it doesn't hold my interest. Over the years they have spun off various subjects and made then the subject of other specialist magazines, boats, aircraft and now all the workshop stuff has gone to MEW. This leaves very little left in ME if your interest isn't in steam trains.
        At the moment I am in the process of sorting out all my back numbers, see:-'s.jpg
        These start at 1940 in the near left and go round to 2000, near right. There is at least one year in each magazine file and all the loose stacks in front are duplicates. I think I have some years duplicated about 5 times. We are gradually getting round to this so I'm not short of reading material {grin}.

        John S.

        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.


        • #19
          Hi John

          Yes, I agree the countersink is a simple design. When I saw the photo you took, I thought I'll make on eof those, and saved the image to use as a guide.


          Kind regards

          Kind regards



          • #20
            Make sure you show us the baby pictures after you try your own CS! <g>

            ...and I thought I had too many magazines and books - I have given away, thrown out, or sold a 52' trailer worth over the years. I am sure I could have bought 4 CNC machines for the cost of reading material bought over the years. Very little was of visual content only and of intellectual value only to my best "friend". <G>


            • #21
              Rotate, The method you use doesn't matter, except when drilling and tapping a part that is going to be heat treated.On a part to be heat treated the hole HAS to be chamfered before tapping.If done in opposite order, run a hand tap in hole before heat treating.Chamfering after tapping distorts first thread. A method I use is centerdrill then drill.After drilling set up a stop on table or set in untightend vise(opened up approx..062 larger than part)and set quill depth.Countersink all your holes.This will make all your CS depths the same without the grief of having to change at least one tool & will allow you to do both sides on through holes just by flipping part (do major burr side first).You can also chuck up a CS & manually hold & push part against rotating CS for a slight cham on small holes. I've used the chambits T&C grinder mentioned.I had nothing but problems out of them.They have a tendency to push up the drill when using them on tougher or harder mat'ls.They are also a pain to get the depth set right for blind holes.Maybe someone out there knows some "tricks " to get them to work but this has been my experiences with them.
              ...the order of bringing about change
              is the four boxes: