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Re: [multimachine] Hydraulic piston rod machinable? / more

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  • keith gutshall
    Hello Pat  You do not need very large pulley to work. the numbers are with a 1725RPM motor   a 2in on the motor a 7in on reduction shaft gives 3.5to1 make
    Message 1 of 9 , Nov 6, 2010
      Hello Pat
       You do not need very large pulley to work. the numbers are with a 1725RPM motor
        a 2in on the motor a 7in on reduction shaft gives 3.5to1 make the rpm 493 for the
      red. shaft
       A 2in on reduction shaft with a 6in pulley on the main shaft turns 164 rpm .
       That looks close to your design numbers.

      Deep Run Portage
      Back Shop
      " The Lizard Works"

      --- On Fri, 11/5/10, Pat Delany <rigmatch@...> wrote:

      From: Pat Delany <rigmatch@...>
      Subject: Re: [multimachine] Hydraulic piston rod machinable? / more
      To: multimachine@yahoogroups.com
      Date: Friday, November 5, 2010, 4:36 PM

      Thanks Darald
      I think I went too far trying to save money!
      The hardened piston rods would be fine for round ways but 24" of 1.5" shaft and stock size bushings are cheap enough. What I have in mind is a replaceable spindle/pulley type machine. You can't realize the belt slippage, power waste and pulley cost problems I have had  trying to get the spindle to turn slow enough for a horizontal mill cutter.

      Clothes dryers show us the power of a giant pulley and this is what I want to use to drive a 1 1/2" horizontal milling spindle (turned down to 1.25")turning at about a hundred RPM or less. I would also have a 1.5" spindle threaded 1 1/2 8tpi for a lathe spindle with a fixed pulley running about 150 RPM. A higher speed milling R8 spindle would be drilled for a draw bar.

      The important thing is that the three spindles could all be self booting. The lathe spindle could be threaded with a thread follower, the horizontal mill spindle could be easily turned down on the end and the R8 collet spindle could be reversed so that draw bar hole could be drilled from both ends. The lathe spindle would need a shoulder added but this could be brazed on and then machined to clean up.

      Your comments are important since something like this will go in the Book.


      From: o1bigtenor <o1bigtenor@...> spindle 
      To: multimachine@yahoogroups.com
      Sent: Fri, November 5, 2010 10:43:01 AM 
      Subject: Re: [multimachine] Hydraulic piston rod machinable?

      On Fri, Nov 5, 2010 at 8:39 AM, Pat <rigmatch@...> wrote:
      > The rods seem to often be measured in inches and not in metric sizes. This means that standard size bushings would fit and be a real money saver. Could the rods be threaded or easily turned down?

      That would depend upon the hydraulic shaft!!

      If it is hardened and chromed (or nitrided) - - good luck. I can give
      you some ideas for procedures - - its ugly though!!

      If it is surface hardened (+ as above) - - that´s a little easier.

      If its just chromed shafting (most likely something like 1045 steel)
      that´s not too bad. Just make your initial cut to well under the
      chrome (0.040 depth of cut or more with more being better!!) and the
      chrome will flake off quite readily.

      Doing something like this WILL take sturdy equipment - - you will have
      a lot of fun trying to do it on stuff that has some flexing!!


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