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Thread: Your latest project
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21st Jan 2019, 03:04 AM #2266
Hi Bill,
Nice one I've seen wobbler’s driving small electric motors as generators, so I don't think driving a pencil sharpener is beyond you.Best Regards:
Baron J.
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11th Feb 2019, 02:33 AM #2267Diamond Member
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- Feb 2013
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Re-threading an unusual internal thread.
Hudson Motors from the 30s to the 50s used double threaded suspension bushes, the ID was threaded 11/16" x 11 tpi (UNC), the OD was 7/8" x 11 tpi but a very shallow thread with an included angle of 150°, thread depth is .3mm. (Sounds weird but there were good reasons for using the shallow thread). This particular bush screws into a matching thread in a cast steel chassis member but unfortunately the thread was stripped and the bush wouldn't tighten up, it wasn't secure in the chassis. The problem was doubtless caused by years of pounding along rough dusty roads.
IMG_2262.jpg
So how to fix it? I briefly contemplated using one of the high tech epoxies to bond the bush in place but decided that the best course would be to make an oversize tap, clean up the threads and then make a bush with an oversize OD to suit the new hole.
Step 1 was to make a 150° threading tool, which I made from silver steel.
IMG_2266.jpg
Step 2 was to make the tap. I decided on an OD of 0.9" (7/8" + 2 x thread depth), I figured (hoped) that would be enough to clean up the damage inside. I roughed out the tap, cut the 6 flutes on the mill and then single pointed the threads, the threading tool worked very well. I didn't have a suitable piece of silver steel from which to make the tap so I used 1020 and hardened it with cherry red case hardening powder. After hardening I used a 4" cut-off blade in the angle grinder to hone the teeth, running the blade along the flutes just kissing the edge of the teeth. All very high tech.
IMG_2259.jpg
The tap worked, I don't know how many more holes it would have cleaned up but it got this job done.
After that it was plain sailing. I made the oversize bush from a piece of 4130 using the same 150° threading tool and oil quenched it. The new bush screws up tight in the chassis, all is well with the world.
IMG_2260.jpg
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11th Feb 2019, 06:57 AM #2268Golden Member
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- Apr 2009
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- Ballina N.S.W.
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bob ward,
I like your well thought out fix, a bit of a project to make up the tap and thread tool but now you have it as good as new. Did you do both sides ?
Bob
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11th Feb 2019, 03:14 PM #2269Senior Member
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- Perth
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11th Feb 2019, 09:00 PM #2270Diamond Member
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- Feb 2013
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- Laidley, SE Qld
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11th Feb 2019, 09:15 PM #2271Diamond Member
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That one bush was used throughout the car’s suspension system, including the eyes of the leaf springs. The insides of the leaf spring eyes were left plain (rather being tapped) and the shallow thread bush could burrow its way in and hold tight, think of a 7/8” self tapping screw.
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12th Apr 2019, 11:13 PM #2272Diamond Member
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- Oct 2008
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- N.W.Tasmania
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Chris, I can see why they would be a hit, But AFAIK tampering with such items is considered a little naughty, and possibly best not widely publicised on forums such as this. We don't want to see your toes crunched by some overly zealous bureaucratic type. I must stress that I am no lawyer, and it certainly does not offend me, but unless you have good advice to say there are no ramifications to worry about, a quick edit of the post to remove any offending bits may save you some un-needed hassle. Just my 20 cents worth anyway
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12th Apr 2019, 11:43 PM #2273Most Valued Member
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- Nov 2007
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- melbourne australia
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Oh alright, post deleted.
BTW ropetangler, it cost 40c to make.Chris
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13th Apr 2019, 12:24 AM #2274Senior Member
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- Oct 2015
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- melbourne
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So now I am curious... Tampering with what is 'naughty'...
'
Russ
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13th Apr 2019, 07:41 AM #2275Pink 10EE owner
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- Aug 2008
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- near Rockhampton
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13th Apr 2019, 09:23 AM #2276Most Valued Member
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- Nov 2007
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- melbourne australia
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How am I going to achieve world domination if I let you all in on the secret to free energy?
Chris
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13th Apr 2019, 10:28 AM #2277Most Valued Member
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- Jul 2006
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mmm? what did I miss
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13th Apr 2019, 03:56 PM #2278Senior Member
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- melbourne
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I did wonder if it was a coin...
And I was about to say that wasn't illegal but it turns out it is in Australia.
Russ
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13th Apr 2019, 06:39 PM #2279Golden Member
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- Jan 2016
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Did you make some jewellery out of currency?
Coin rings perhaps...?
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23rd Jun 2019, 03:32 PM #2280Member: Blue and white apron brigade
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- Feb 2006
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- Perth
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Heat sink
This is a bit of nonsense that I probably shouldn’t have started with but as I got further and further involved with it I wouldn’t let it defeat me.
A while back I pulled apart an old electrical fan/heater to recover the electrical parts.
The heater was the type that has the fake/plastic logs under which a slowly rotating flickering mechanism scatters reflected light from an orange coloured incandescent globe.
The rotating flickering mechanism (the reflective tree like thing in the photo) was rotated by a small mains powered motor shown in this photo.
The reflector is connected to the motor axel via a stiff piece of thick black rubber tubing.
refelectormotor.JPG
I put the motor inside a stub of 100 mm PVC pipe, capped at both ends with PVC end caps, with the motor drive axel poking through one of the caps.
For a bit of colour I added 6 coloured LEDs inset into the cap around the axel.
All well and dandy and feeling very pleased with myself because apart from the LEDs everything else came from the heater itself (cable/gland/switch), and the 15V power adapter to run the LEDs came from my box of adapters.
The plan was to give it to my son for my grandsons bedroom as a sort of an hypnotic night light.
Then I fired it up and after about 15 minute I notice the PVC around the motor was relatively warm and followup testing with an IR meter showed the outer PVC eventually reached ~45ºC while the motor inside was over 60º.
I then remembered that inside the heater a fan drove air past the motor and out over the heater element.
I was loath to add a fan so I decided to make a heat sink to see if that would drop the temperature.
Making the heat sink turned out to be a bit of PITA because the motor axel is off centre but I persisted and turned it up out of stub of solid Al.
IHSink1.JPG
I then added some small vent holes to the PVC, and thermal paste between the motor and the heat sink now the heat sink reaches ~40ºC while the motor now seems to plateau at about 45º so it's clearly working.
I’m going to run it for several days just to see where it really gets to.
Here's what it looks like in its entirety
The LEDs are faintly reflected by the reflectors a bit like a kaleidoscope onto light coloured walls of a darkened room.
Gizmo2.JPG
Gizmo1.JPG
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