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Old Sep 11, 2009, 01:58 AM
Bush Mechanic
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Mt. Dandenong, Australia
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What about a complete combo system with a common cutting bow that will profile cut as per your photo and "airfoil cut" as well.
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Old Sep 11, 2009, 02:17 AM
PLD
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Don't you think it'd be better to use two entirely different mechanical setups for that, rather than a common bow? The cutting height of my little benchtop one is rather small.

If I went with a larger bow, eg for actual wings, I'd probably change to SS wire rather than nichrome too, at least then one could eliminate the need for the spring for the most part
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Old Sep 11, 2009, 02:36 AM
Bush Mechanic
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Mt. Dandenong, Australia
Joined Oct 2005
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OK I agree, but I see an allrounder kit as a good proposition. Why not use SS as the hot wire in the "profile cutter" or shall we say "hot wire bandsaw". Nichrome can be a pain in the posterior.
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Old Sep 11, 2009, 02:45 AM
PLD
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For the smaller length, the SS has a bit of a problem of the lack of resistance, meaning that it will drive the temperature controller potentially into premature shutdown. As nichrome has ~13R/m resistance, that means this setup is about 2R, where's SS would be vastly lower, around 0.2R at best. At least with this setup the spring tension is easy to do (see attached photo).
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Old Sep 11, 2009, 06:27 AM
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http://www.demandproducts.com/multicut.php
http://www.google.com/products?hl=en...itle&resnum=10
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Old Oct 14, 2009, 02:06 AM
PLD
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Hi everyone, yes, I'm back again, at least in spirit

Next project to be pushed is the low-ohms-meter (as apposed to the internal-resistance-meter).

The LOM is more of a specialist tool but it's also rather invaluable when it comes to checking connections, looms and motors.

The idea is probably to put it in a full housing and have a 4-banana-plug connection setup which means that people can use any suitable combination of parrot, kelvin, alligator leads as they require.

The LOM will only be pushing about 2~5mA of current through the system being tested so it'll be quite safe.

Paul.
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Old Oct 14, 2009, 02:41 AM
ancora imparo
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Melbourne, Australia
Joined Jul 2005
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Paul, good to have you back and raring to go! You know about this one?

Approx. $100 as a kit, $150 assembled from a Perth mob

http://www.blueesr.transelectronics.com.au/

John

Specifications:Measurement range: 0.01 to 99 ohms, auto-ranging
Peak voltage across capacitor under test @ full scale: 100mV
Update speed: 4 readings/second
Power supply: 9 volt battery (not included)
Controls: Single push button for power on/off and zero
Dimensions: 5.75x3.5x1 inches (147x86x24mm)
Features:Tests electrolytics in circuit, & test leads are non-polarized
Test lead resistance compensation
Automatic power off when reading is unchanged for 3 minutes
Low battery voltage warning
Easy-to-read, high brightness 0.5 inch (13mm) piercing
blue LED display
Chart of good capacitor ESRs on the front panel

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Old Oct 14, 2009, 02:55 AM
PLD
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John,

That's an ESR meter, not quite the same thing. ESR gives you the equivilant series resistance of the capacitors but the LOM I'm planning is for measuring leads, connections, motors etc (eg, resistive elements).

Also I'm looking at doing 0.001R ~ 20R and using a 16x2 display (since that's the most cost effective solution I can conjure, even 2x7-segment unit setups like that work out the same/more).

Unless I completely missed your point ? (correct me if I have... my first day back at using this brain ).

Paul.
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Old Oct 14, 2009, 03:42 AM
ancora imparo
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Well looks like the new brain is just as sharp as the old one.

I thought an ESR meter was just an AC low ohm meter. This one claims 0.01-99 ohm and has an equivalent test frequency of 100kHz. If yours is DC and 0.001ohm that is a lot more useful for us since we wouldn't have to worry about inductive effects. Motor windings in particular couldn't be measured with an ESR meter I guess. the 16x2 display sounds a lot sexier too!

John

PS I've still got the 4 wire single cell connector i bought for the PIRCAT/single cell IR meter. Don't forget it entirely.
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Old Oct 14, 2009, 03:57 AM
PLD
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John,

Aaah, while the mini-XLR might have been a needed thing for the PIRCAT due to the current demands, I think that for modularity I'll stick with the 4x banana sockets on this one, also I can mount them direct to the PCB if needed, plus the only kelvin leads ($200 AUD+) I can find are all banana plug types.

I do wish the mini-XLR was cheaper though, it's a nice connector in every other respect.

Paul.
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Old Oct 14, 2009, 05:14 AM
ancora imparo
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Melbourne, Australia
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No, I meant this one. 4 wire single cell holder.
It's been patiently waiting to be soldered to a single cell IR meter.
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Old Oct 16, 2009, 12:06 AM
PLD
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Okay, I've finally found a crucial component supply at a suitable pricing to make useful for many projects here... an 8x2 character LCD (the normal ones I use for the IRMs are 16x2 char).

While the 8x2 uses up just the same number of control lines and such, it's a nice display to have because it's slightly cheaper than the 16x2 (surprisingly that's not a normal situation as 8x2's aren't as common on the assembly line) and the 8x2 is of course physically smaller, meaning I can cram it into smaller cases (which cost less!).

I'm thinking of using these for the LOM, since there's not a lot of information needed to be displayed by the LOM other than the.... resistance

Paul.
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Old Oct 17, 2009, 10:04 PM
Rusty
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Auckland, New Zealand
Joined Feb 2006
906 Posts
Mixer

Quote:
Originally Posted by flybaby2000
hey paul ..

how about a v-tail mixer with rates that can be set independently from one another , they had one years ago , but it would set all rates the same and was hugeemongus ... a nano mixer would be cool for all those smalle wings ive got

cheers
doug
I'm using this one:
http://www.flycs.co.nz/index.php?pag...mart&Itemid=55
Quite expensive (compared to whole radio sets that cost that much with mixing included!) but works well.
You can also dial down (dual rate) your elevator transmitter pot with a secondary pot across it attached to the top of your transmitter.
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Old Oct 22, 2009, 04:47 AM
Registered User
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Weipa Queensland
Joined Jul 2007
180 Posts
Paul how about a regulator come low voltage cut out for those of us who are using lipo's in there tx's. You could have a low voltage alarm for several minutes who's tone gets progressivly closer and then lights out. I recently left my radio on and flattened the lipo so I have jammed one of your lva's in the back of the tx untill you come up with a good solution.

Tony
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Old Oct 22, 2009, 08:15 AM
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Indianapolis, IN USA
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There are already many lithium protection devices out there. For example: http://www.batteryjunction.com/pcb.html
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