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27510Re: [GrizHFMinimill] Re: boring in steel

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  • Malcolm Parker-Lisberg
    Jul 11, 2014
    • 0 Attachment
      John

      She is looking good, I like the jigs, but the silver solder does not seem to have fully penetrated in a couple of the photos, particularly the backing plate for the cylinder and the tube plate .

      Malcolm

      --------------------------------------------
      On Fri, 7/11/14, John Lindo bechetboat@... [GrizHFMinimill] <GrizHFMinimill@yahoogroups.com> wrote:

      Subject: Re: [GrizHFMinimill] Re: boring in steel
      To: "GrizHFMinimill@yahoogroups.com" <GrizHFMinimill@yahoogroups.com>
      Date: Friday, July 11, 2014, 6:05 PM


       









      Malcolm.Never wish to hard,it may come
      true.This was some of the boiler work
      in progress.I eventually used my outside
      kitchen stove top to get some heat into the copper for
      brazing.Minnie
      boiler construction
             Minnie
      boiler constructionMinnie
      boiler construction (70
      photos)View
      on plus.google.comPreview
      by
      Yahoo 
      More
      photo's to follow next week,up to the boiler
      completed,smoke box,smoke box door,chimney,front
      axles,wheels,now
      onto the cylinder block,that's a minefield.John


      On Friday,
      July 11, 2014 6:16 PM, "Malcolm Parker-Lisberg
      mparkerlisberg@... [GrizHFMinimill]"
      <GrizHFMinimill@yahoogroups.com> wrote:




       









      John



      When will we see pictures of the traction engine
      progress?



      Malcolm



      I don't suffer from insanity I enjoy it!

      Mene, mene, tekel, upharsin

      The writing is on the wall.

      Ha-ktovet al ha-kir



      --------------------------------------------

      On Fri, 7/11/14, John Lindo bechetboat@...
      [GrizHFMinimill] <GrizHFMinimill@yahoogroups.com>
      wrote:



      Subject: Re: [GrizHFMinimill] Re: boring in steel [1
      Attachment]

      To: "GrizHFMinimill@yahoogroups.com"
      <GrizHFMinimill@yahoogroups.com>

      Date: Friday, July 11, 2014, 4:08 PM





       



















      [Attachment(s) from John Lindo included

      below]





      Another tip,is to bore coming out

      of the hole,the chips will fall to the bottom,also on a

      lathe,especially a blindhole,the chips will migrate to

      the front and fall out.it's always the chips that

      cause you problems once the tool is ground and set

      correctly.I use an air line to clear the

      chips,but NOT when the spindle or boring bar is

      rotating.I just bored out a

      chimney for a model traction engine,had to come in from
      both

      ends,total length 175 MM about 4

      1/2"

      the dia 19 mm approx

      3/4",machined out of solid

      bar.

      JohnSpain



      On

      Thursday, July 10, 2014 1:24 PM, "sgtcude

      sgtcude@... [GrizHFMinimill]"

      <GrizHFMinimill@yahoogroups.com> wrote:









       



















      assuming your doing this on a mill. the longer
      your

      boring bar is the more its will flex away from the side
      of

      hole . also is how you sharpen the bit if not flat it
      will

      dig in causing to cut bigger or help it to flax away .
      One

      way to see if it flex away is as u move bit out see if
      it

      dig into the side. Also the boring bar needs to be slip
      fit

      into boring head this will help stop chatter and other

      problem   





      On Wed, Jul 9, 2014 at 9:10 AM,

      Scott J Hicks scottjhicks@...

      [GrizHFMinimill] <GrizHFMinimill@yahoogroups.com>

      wrote:

































       



















      What are spring

      passes?

      Scott



      Sent from my iPhone

      On Jul 5, 2014, at 4:41 AM,

      "joe gifford argie1891@...

      [GrizHFMinimill]"
      <GrizHFMinimill@yahoogroups.com>

      wrote:





























































       



















      don't forget to make

      spring passes before you get to final size. I once bored
      a

      hole in steel and to smooth out the hole I took several

      spring passes... wow now my hole was grossly over size.
      it

      is hard to believe there is that much spring in a 3/4
      inch

      boring bar made from good quality steel. I have learned
      a

      lesson measure while taking spring passes to smooth out
      the

      bore. argie1891 aka joe



































































































































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