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  1. #2026
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

    Default

    All good questions Graham, it does use special files as it only cuts on the downstroke, you can modify normal files by flipping them and grinding a point on one end, but they cannot be tapered at all.

    It just has a straight up and down reciprocation with an adjustable stroke from 1/2 inch to 3 inches.

    Generally these were used in toolrooms or die shops, with a tilting table its useful for putting draft angles on internal edges. Although ill be more using it for fine finishing and as a beefy scroll saw until I make some more files.

  2. #2027
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default

    Thanks Caskwarrior,
    Naturally I have read about them but never seen one for real.

    The questions I asked did not seem to be covered in the online information I had come across.

    Thanks for setting me straight.

    Grahame

  3. #2028
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    72
    Posts
    3,102

    Default

    Finished a bull-nose or pipe centre.
    Design and bearing idea came from Cascao on the Hobby-Machinist forum.
    It utilises a (non-driven) wheel bearing, the double angular contact type. Bought on AliExpress for $16.00 delivered (https://www.aliexpress.com/item/DAC3...813333230.html)
    The arbour is made from a piece of hydraulic ram rod - MT2 one end tight slip fit into the bearing the other end, with a threaded bore to hold the bearing on.
    I threaded the nose M12 to drive it for final machining and to extract the bearing (including washer and bolt) if I ever need to. It will get a dust seal in use.
    The cone is a piece of 100mm dia off-cut. Pretty tough stuff but machined OK with the right tipped tool.
    20171222_223715 (Medium).jpg 20171222_223823 (Medium).jpg 20171222_234351 (Medium).jpg
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  4. #2029
    Join Date
    Oct 2010
    Location
    NSW
    Posts
    177

    Default

    Clever idea for the drive and bearing extraction Joe.

  5. #2030
    Join Date
    Aug 2013
    Location
    Melbourne
    Posts
    229

    Default

    Oil Blacking
    Made some vise hold down clamps, and finished them with the old sump oil treatment.
    l first tried this about 25 years ago on some bandsaw guides, which have stood the test of time (no rust)
    IMG_1840.jpgIMG_1842.jpgIMG_1841.jpg
    It is a quick and easy process, just heat the part up and drop it (carefully) in a metal container full of old sump oil and allow to cool. (Tip - depending on how much heat is applied, have a lid handy to snuff out any flames)
    Pete

  6. #2031
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    Those look good. Are they machined from one piece? With the oil blackening, do you heat them till they are glowing red?

  7. #2032
    Join Date
    Aug 2013
    Location
    Melbourne
    Posts
    229

    Default

    The clamps in the foreground were a bit narrow so l added a wider tail piece. The other clamps are one piece ( plus the 2 round bars)
    Temperature required is fairly hot, but certainly not red hot. I just use an lpg torch, maybe just past "blue"
    Pete

  8. #2033
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    I have been fiddling around with making a hydraulic powered air compressor that I can power off the hydraulics of my Dingo and carried on the dingo forks.

    The compressor head is one I have had for twenty years or so, it was diesel powered but never easy to use as it was large, bulky, in a very heavy setup and the motor was hard to start.

    So I bought a chinese made 50cc hyd motor and I had an air tank from a defunct small compressor and bolted it all together.

    It works really well, I just need to guard up the compressor fan. The compressor was rated at 60CFM free air delivery. It is going to be very handy.

    20180220_160212.jpg20180220_160203.jpg
    Gold, the colour of choice for the discerning person.

  9. #2034
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    What do you think it would be rated to now with the hydraulic powered motor?

  10. #2035
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

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    Well the 60CFM FAD was with the compressor doing 810rpm. I have it running at 770 according to the tacho. That is with around 2050psi.
    Gold, the colour of choice for the discerning person.

  11. #2036
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    Interesting that such a small motor can achieve that result. Gotta love fluid power

  12. #2037
    Join Date
    Oct 2015
    Location
    melbourne
    Posts
    473

    Default

    Quote Originally Posted by caskwarrior View Post
    Today i got this Steelfast die filing machine put back together, I recieved it dismantled and it was a bit of a puzzle to get back together, but is in great nick and runs very smoothly, unfortunately I only have one suitable down-cutting file, if anyone has anymore i would be grateful. It has the number 59 stamped on its castings so I guess they didnt make very many, the motor thats on it would date it to the late 50s early 60's at a guess. It has one very smart feature, the other end of the countershaft runs a little bellows, at first i thought it was a lubricant pump so i filled it with oil but it pumped it out with such violence that it can only be for air to blow chips away from layout lines on the work.
    Attachment 371336
    Ah... I have some of those hold down fittings! Always wondered what they were Your latest project

    Now to find a use for them.
    Perhaps I should build a die filer. I had one on my to-do list anyway.


    -russ

  13. #2038
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    Quote Originally Posted by Com_VC View Post
    Interesting that such a small motor can achieve that result. Gotta love fluid power

    Well a hydraulic motor is really nothing more then a hydraulic ram with an infinite stroke. So the torque at 0 rpm is similar at the max rpm.

    This motor is putting out about 90 to 100 newton metres to run the compressor at 120psi and around 10hp at max flow. Great thing is I can just slow it down when I am just filling tyres or using air tools. You usually can not do that with a combustion engine as their torque output drops so low at lower RPM.

    I am chuffed that I fluked the match of the motor to the compressor so well. I did do some calculations prior to ordering the motor, but was never sure.
    Gold, the colour of choice for the discerning person.

  14. #2039
    Join Date
    Aug 2015
    Location
    Melbourne
    Posts
    69

    Default

    Are you able to share where the motor came from and how much?
    I've got a bit of experience using Parker motors and the price is fairly prohibitive for home jobs.
    this might be ideal for a project that is sitting idle at the moment

  15. #2040
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    Sounds like they have a lot of potential, never played with hydraulic motors before only rams. I picked up a hydraulic wheel motor awhile back, might be good for a tube bender or something. So something like this could easily be powered by a log splitter type pump is that correct?

    EFI_914 should be able to find something used quite easily, scissor lifts, bob cats etc.

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