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Author Topic: Winders, winding stooge, torque meters, winding methods  (Read 41825 times)
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Olbill
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« Reply #200 on: March 01, 2011, 12:26:51 PM »

Thanks for the plug Tony. The check is in the m....... (oops)
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_shadow_
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« Reply #201 on: May 01, 2012, 05:57:17 AM »

Guys,

I just completed the Chain Gang Winder...it's SUPER smooth!

Regards
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flydean1
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« Reply #202 on: May 01, 2012, 09:08:00 AM »

Very out-of-the-box!!!

How about a picture of you winding a motor with it?!?

I'm trying to envision a 30gram Wakefield motor wound to near 100 oz/in torque.
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Art356A
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« Reply #203 on: May 01, 2012, 10:16:24 AM »

Sorry, Dean, we figure 6 oz/in is the limit. I can get metal chain with a .250 pitch, but the thing would be big and awkward. I'm afraid you're stuck with the
Sidewinder, which is a pretty good deal for the money anyway.

art
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« Reply #204 on: May 01, 2012, 10:26:11 AM »

Very out-of-the-box!!!

How about a picture of you winding a motor with it?!?

I'm trying to envision a 30gram Wakefield motor wound to near 100 oz/in torque.

I take that as a compliment!!

I fly indoor duration and maybe will venture into peanut scale....so I guess 6 oz/in is good enough for me.

Regards
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flydean1
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« Reply #205 on: May 01, 2012, 01:51:02 PM »

Oh!  Now I see, this is the indoor section. Embarrassed Embarrassed

Yeah that would make my analogy a bit out of line.  It was difficult to tell the size of the winder, from the photo.  Should work just fine.  Seems similar to the Rees Scale Winder, but with chains and sprockets rather than gears.
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Dave Andreski
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« Reply #206 on: May 01, 2012, 02:10:29 PM »

Oh!  Now I see, this is the indoor section. Embarrassed Embarrassed

  Seems similar to the Rees Scale Winder, but with chains and sprockets rather than gears.

NO similarity at all.
This one's a lot different.
Dave Andreski
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Art356A
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« Reply #207 on: May 01, 2012, 05:24:54 PM »

Dean, it's 1.8 high, 3.5 wide and 1.21 thick, plus the counter and its bracket. The main thing is that there is no friction with sprockets and chain. You can let an A-6 or LPP motor wind back against the internal friction and you'll typically have only 8 or 10 turns left.
Didn't the Rees winder wind backwards, or am I thinking of something else?

Wait 'til we get flying at Lakeland, and you can come over and play with one yourself.

Art.
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flydean1
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« Reply #208 on: May 01, 2012, 10:47:01 PM »

The Rees winder did wind backwards.  He put an arrow on it to remind the unwary.

More power to you to fly at Lakeland.  Just my luck.  I now live in Dothan, AL! Sad
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_shadow_
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« Reply #209 on: May 04, 2012, 08:58:54 AM »

Next project is a digital torque meter....here is what I have so far.

Plenty of cool ideas here in this thread....once I get it done, I'll create another thread on the build.


Regards
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« Reply #210 on: May 24, 2012, 10:13:35 PM »

Guys,

Digital Torque Meter build thread...

http://www.hippocketaeronautics.com/hpa_forum/index.php/topic,12056.0.html

Regards
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green-man
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« Reply #211 on: May 25, 2012, 02:13:06 AM »

It looks good shadow Smiley
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Hepcat
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« Reply #212 on: May 25, 2012, 10:41:17 AM »

Shadow

That is a marvellous set of pictures.  Just looking at them I feel I could make a torque meter and then common sense takes over and tells me I should be too scared even to start.  For those few people like me who can understand + and – in a sum but when it comes to electricity don’t even know if the little thingies flow from + to – or – to +,  could you please add a few words?

John
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« Reply #213 on: May 26, 2012, 01:52:22 AM »

Guys,

Thanks for the compliments...pictures say a thousand words, thats the reason why I didn't write anything. Will gladly answer any questions!

Regards
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« Reply #214 on: May 27, 2012, 10:43:20 AM »

I guess these make a good combo in learning about rubber.

Regards
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« Reply #215 on: May 28, 2012, 09:00:45 AM »

For iPhone users,

Download iSpreadsheet, it's free! This app is Excel like and has enough columns to make the flight log as described by Ray's article in his website.
The app has 50 rows, which is good enough to enter data which then can be emailed out and read using MS-Excel, the file is CSV format.

Give it a shot!

Regards
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Pit
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aka staubkorb


WWW

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« Reply #216 on: May 28, 2012, 09:14:46 AM »

That iSpreadsheet is nice (but iDon't have an iPhone Grin).  Is there something similar/identical for Android (quick search revealed zip)?
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« Reply #217 on: May 28, 2012, 09:48:39 AM »

Sorry...no idea if there are any similar app for Android!

Regards
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rodders67
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« Reply #218 on: May 29, 2012, 05:51:13 AM »

While browsing Hip pocket last year I came across some pictures of a digital torque meter.  I thought that the use of a digital balance to measure the reaction force was an excellent idea. I decided to have a go at building one, but before I cut metal so to speak, I decided to discuss the idea with a couple of experienced indoor duration flyers here in the UK.   An observation was that the horizontal display made it difficult to see the readings when winding a stretched motor and  I also disliked the idea of chopping up a balance.  So my brief for the project was (1) an upright display and (2) retain the balance as a reusable item.  Finding a balance with an upright display at a reasonable price took some time online however I eventually found one.  To keep the balance in one piece I decided to construct a cantilever arrangement for the hook and the reaction arm. This arrangement allowed me to have the balance in a cradle and removable when not in use as a torque meter.  The arrangement can be seen in the attached photographs.  The reaction arm is set at 1 cm from the axis of the hook allowing, the display to directly indicate gram/centimetres of torque.  Unfortunately the ROBO balance shown, while fulfilling point (1) was unusable, as it had a long settling time.  When winding or unwinding, the lengthy time between the load being applied and the result shown, caused the display to change in large irregular steps.  Further searching provided the second balance shown. The inclined display is readable when winding a fully stretched motor and this balance reacts very quickly and has been in use now for a couple of months.  As can be seen, the cantilever arrangement is constructed from square section alloy tube, bent to support the cradle for the balance and hold the reaction arm / hook arrangement over the balance. The reaction arm / hook are supported on two small ball bearings.  I have used balances with resolutions of 0.1gms   and 0.01gms and found the 0.1 gram balance preferable, as the display on the more sensitive balance was always flickering back and forwards, even when holding the motor steady. Apart from the balance which cost £10.00 all the rest came from my left over bin.  A few parts were made using a lathe and a milling machine but I am sure that a similar arrangement could be assembled without these tools.
Winders, winding stooge, torque meters, winding methods
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« Reply #219 on: May 29, 2012, 07:17:56 AM »

That ROBO scale would have been the ticket if it had worked well.

Regards
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Olbill
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« Reply #220 on: May 29, 2012, 01:22:28 PM »

The inclination of the LCD panel has been discussed previously. There is a compromise necessary between being able to read the scale at a distance and being able to read it when you are at the end of a wind. For my scales a too upright position of the LCD will make it unreadable when you are close to the end of a wind and looking almost directly down on it. For my winding style the torque reading is unimportant until I am finishing the winding. I use a proportion of the expected number of turns to gauge my distance from the stooge until maybe the last 10 or 20 percent of the wind. I'm not saying that everyone winds that way but I personally have no clue what the torque readings mean for the earlier part of the process.

As far as destroying scales go - the one I use in my torque mneters costs about $8. It is unsuitable for anything else associated with my indoor flying. The scale I use during building is a milligram scale that costs about $15. It is also modified in a way that makes it pretty much useless for anything other than indoor building. Before that I used an Acculab milligram scale that cost about $250 and is pretty much useless for weighing anything because it drifts constantly.
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« Reply #221 on: August 01, 2012, 09:38:12 PM »

Guys,

Here is my modified K&P with a digital counter.

The bracket is 1/8" lite-ply cut to size, counter is the OMRON H7EC, small reed switch and magnet, some lead, bolts and nuts.

The rotor is installed onto the winder's plastic bush which is connected to the output gear, I filed the tip to a small rectangular shape to get positive lock on the rotor, rest is 5minute epoxy and spider wider wrapped around for added security.

The counter has a 1kHz frequency capability and I have tried winding as fast as I could and it didn't miss a count!

I'll be converting the 15:1 K&P counter next!

Regards
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_shadow_
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« Reply #222 on: August 01, 2012, 09:40:31 PM »

More photos....

Regard
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Art356A
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« Reply #223 on: August 01, 2012, 10:47:25 PM »

Neat work, Shadow.  I never realized that the white nub rotates with the hook shaft. I thought it was a bushing.

If you really want to test it to the limit in a totally non-real-life situation, wind a motor up tight, note the turns, zero the counter and then release the crank to run back free. See if you get the same number of turns. I do and I'm sure you will too. Your counter will handle 60,000 RPM. The reed switch will handle 1,800,000 RPM (the mfr told me 30KHz, I'm not sure I believe them). Wear asbestos gloves.
Art.
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« Reply #224 on: August 02, 2012, 01:47:24 AM »

Art,

Thanks for the compliments....it's a copy of your idea!  Grin The next is to figure a way to put in a brake.

I'm confident that it's counting accurately per its design limitations and since this winder is a bit on the 'tight' side, the test would need a thicker rubber to fully unwind, we'll see how it goes.

For the 15:1, I might just build another set of frames and use the innards of the KP winder + the rotor, I have nice 1.5mm aluminum sheets just for that.

Regards
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