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Ba$#~£d day, ba<*":d job.

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  • #16
    Two containers of Lubricant , possibly from a grateful customer.
    Thats how I keep my OP Rum supply topped up.

    Nice work even if it pi$$ed you off while completing the task.


    • #17
      Originally posted by john hobdeclipe View Post
      My Dear Friend John,

      In your second picture I can't help but see a bottle of some sort of "solvent" just in front of the blue handled hex wrenches.

      What is it? Does it help? Or is it indeed a lubricant instead?

      Just curious,

      Your Friend John
      That's the central heating.

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


      • #18
        Originally posted by John Stevenson View Post

        That little cock up by whoever ? cost me about two hours extra, 3 triangular boring tips, 4 solid carbide end mills
        Clumsy bastard.


        • #19

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


          • #20
            Maybe you should have given this job to Mohamed.
            The shortest distance between two points is a circle of infinite diameter.

            Bluewater Model Engineering Society at

            Southwestern Ontario. Canada


            • #21
              I dont mean to hijack the thread. But it appears as you guys are talking about a steel that "work hardens"? That is a PH steel (Stainless Steel Round 17-4 (type 630)) is one like that here in the USA. Anyway, my question is, assuming that is what you are using, how do you get the chip breaker to work? I always end up with razor wire from hell. If the carbide bit gets dull then its as hard as the clumsy bastard says "witches tit". I since have changed to using a ceramic bit and that works wonderfully and lasts at least 10x longer than carbide. Thus its many times cheaper than carbide in the end. But it still wont make chips, only razor wire from hell. It does not seem to matter what speed and feed I use. The bits have a built in chip braker. Its a little groove around the top of the triangle bit. You see this on 90% of bits. It seems to work on everything EXCEPT this PH steel. (PH = precipitation-hardening)


              • #22
                Hijack all you want, Doesn't upset me but you mentioned stainless steel and this is medium carbon steel.
                Took it to the hardening shop and expected to get it back later today but they were busy so it won't be ready until the morning.
                It's having 15 thou of case hardening glued on.

                Reason these wear is use or rather misuse. This one is an old design of fork truck where the drive is via a torque converter and forward and reverse is electrical.

                Now if they drive steady, stop, reverse etc they last ages but get some hot shot who goes from flat out forward and straight into reverse without braking and these splines are under tremendous pressure and soon develop play. From then on it's a downward spiral.

                95% of my machining is done with TPUN style triangular tips for three reasons, one is you get 3 edges compared to 2 on other type of tips

                I can use the same tip on external and internal boring tools but the main reason is I bought about 150 boxes of 10 about ten years ago for absolutely peanuts.

                Back to the central heating

                Many, many years ago just after I came out of my apprenticeship, I started work at a truck garage as a lowly fitter, this would be 1968 and as most of us have endured things were a lot different then.
                H&S for one was unheard of.

                The truck garage was big, cold, draughty and most of the time because of what was in the garage and what was hanging out, the doors were never shut. result was in winter it was bloody freezing.

                Add to this because of a lack of planned maintenance the reliability of trucks wasn't that good meaning we spent a lot of time out on breakdowns which was also bloody freezing !!

                Start of the cold weather the boss would walk across the road to the off licence and buy two bottles, a bottle of whisky and a bottle of brandy [ he didn't drink whisky ] and put these on top of the radio.

                When you were cold or just come in from a breakdown you made a coffee and tipped a small slug of whiskey or brandy in, whatever you fancied. Just enough to warm you up, probably 1/2 a cap full.
                No one was ever rolling drunk or pissed in any way but H&S would have a baby nowadays.

                I must admit I have kept that acquired taste and at the end of a day I have a drop in my coffee, don't bother during the day, it's not that cold in my shop now but last thing and when I get in the house knowing I don't have to go out again it nice to put the central heating on.

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


                • #23
                  No, ahidley. Same acronym, different meaning when coupled with medium carbon steels. "PH" is commonly used for "Pre-Hard" for the latter. It may not be technically correct but is extremely common. In my previous reply, all I meant is material supplied with a hardness about ~30HRC.


                  • #24
                    Ok point taken. But never the less does anyone know how to make "chips" vs my razor wire from hell when turning the stainless 17-4.PH?


                    • #25
                      Assuming your lathe has the grunt and rigidly, deeper doc, more feed. And.. real chip breakers. But.. sometimes.... it just won't break easily and little short blue springs are the best you can do.


                      • #26
                        Can gearotic cut those splines?
                        Precision takes time.


                        • #27
                          Take it easy John especially on those pub pies with last years date on them LOL seriously have a great year and enjoy retirement as far as you can buddy regards to you and Gert from Alistair and Bronwen. Alistair
                          Please excuse my typing as I have a form of parkinsons disease


                          • #28
                            Originally posted by .RC. View Post
                            Can gearotic cut those splines?
                            Yes, no problem but because of the way it works, small cuts and lots of them it's not a quick process, guessing about 45 minutes to an hour.

                            Basically fill the boxes in and it spits out the shape and from there you can get the code of a 4 axis CNC.

                            In the example above you put in the DP, 10 in this case, alter the stub from 1 to 0.5 to give the 10/20 form and change the angle to 30 degrees which is the default for involute splines.

                            From the info given on screen, to cut this requires an end mill 0.0923" maximum. Doesn't mean to say you need this size, just that it can't be any bigger but the program will correct to code to suit the cutter.

                            Upside of Gearotic is that you can do many non standard things with it and it's well worth the price. It's a brilliant get John out the $hit program

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


                            • #29
                              Thanks, truly is an amazing bit of software for the price...

                              One day I will get my CNC mill.... One day...
                              Precision takes time.