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Thread: Your latest project
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11th Dec 2017, 05:30 PM #2026Most Valued Member
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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.
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11th Dec 2017, 08:03 PM #2027
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
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24th Dec 2017, 01:08 PM #2028
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).jpgCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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25th Dec 2017, 08:08 AM #2029Senior Member
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Clever idea for the drive and bearing extraction Joe.
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18th Feb 2018, 04:51 PM #2030Senior Member
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- Melbourne
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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
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18th Feb 2018, 05:09 PM #2031Diamond Member
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Those look good. Are they machined from one piece? With the oil blackening, do you heat them till they are glowing red?
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18th Feb 2018, 06:01 PM #2032Senior Member
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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
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20th Feb 2018, 05:48 PM #2033Pink 10EE owner
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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.jpgGold, the colour of choice for the discerning person.
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20th Feb 2018, 05:52 PM #2034Diamond Member
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What do you think it would be rated to now with the hydraulic powered motor?
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20th Feb 2018, 07:22 PM #2035Pink 10EE owner
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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.
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20th Feb 2018, 07:25 PM #2036Diamond Member
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Interesting that such a small motor can achieve that result. Gotta love fluid power
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20th Feb 2018, 10:49 PM #2037Senior Member
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21st Feb 2018, 11:38 AM #2038Pink 10EE owner
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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.
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21st Feb 2018, 04:32 PM #2039Member
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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
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21st Feb 2018, 05:13 PM #2040Diamond Member
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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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