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Del
Junior Member
United Kingdom
369 Posts |
Posted - 29/08/2007 : 20:12:08
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Hi Ralph,
There seems to be two weblinks there. The first one I can't understand as I don't speak German and the second link doesn't seem to work
Cheers
Del. |
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BushWhacker
Junior Member
Canada
325 Posts |
Posted - 30/08/2007 : 02:19:52
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Thanks Del, that gives me about twice the blade theory I had before reading your post.
Tell me, when I look at the photo's of your sets of blades they have a slight "pinwheel" look to them.
(mounted on a slight angle, rather than straight out)
Is this design, or just optical illusion?
I've got some "dead" frying pans, how do you find dead center?
Thanks again!
Just a wee tip for Ralph, You can take those huge links and cut them down to size by going here... http://tinyurl.com/
Copy your huge URL and paste it into the box at tiny URL, click the button and this ...
http://www.marktplaats.nl/index.php?sref=http%3A//%3Ca%20href=
becomes this
http://tinyurl.com/2hvqao
If you copy and paste the tiny URL to your messages and it doesn't make the page three screens wide. ;-)
Cheers!
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
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Del
Junior Member
United Kingdom
369 Posts |
Posted - 30/08/2007 : 09:45:10
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Hi BW,
The trailing edges of the blades are on the 72 degree lines. It is a bit of an illusion isn't it.
Arh, the dead centre thing. I have two methods for you.
First mark out your circle from the frying pan.
Use a drawing compass. and roughly set it to fractionally (maybe 1 or 2 mm more) more than the diameter of the circle and then from the edge of the circle scibe arcs in the middle of the circle from various points around the circumference. It should become obvious that the tiny gap you now have in the middle of you circle is dead centre. I can do a drawing if you want?
Now, the second method is much better I reckon and as accurate as it gets.
You can follow the same steps as per above to get a centre point but when you cut around the circumference don't worry about being too accurate.
Mount your inaccurate circle onto your motor (or a bike wheel spindle or something to spin it on) and as it spins hold a pencil or felt tip pen near to the edge and you will get an absolute perfect circle that way with the centre point absolute dead centre.
How many of use try to be so accurate with our measurements and cutting and drilling only to find that our centre hole is just slightly out, which is only noticeable after is all assembled and spinning away. This will cause big balance issues and restrict the speed of the blades and wear the motor bearings prematurely.
Simple but effective guys.
Cheers
Del. |
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BushWhacker
Junior Member
Canada
325 Posts |
Posted - 30/08/2007 : 18:41:55
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Thanks Del,
I think I'd prefer the second method better, and once it is cut out mount the disc back on a low speed dc motor (powered with a battery charger?) then dress the outside edge with a file. I'd imagine the end result would balance out quite nicely. Boy do I miss having access to a lathe.
Cheers!
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
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Ralph
Starting Member
Belgium
19 Posts |
Posted - 30/08/2007 : 21:52:08
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Did some one found this on the internet?
http://www.pittmannet.com/
Are these the famous Ametek motors? |
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BushWhacker
Junior Member
Canada
325 Posts |
Posted - 30/08/2007 : 22:13:03
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Ralph, this is the famous Ametek motor...
AMETEK 5" Permanent Magnet DC Motor Generator 30VDC
Part No 116400-00
5"(Length) x 4"(diameter)
Key Diameter: 5/8"
Key Length: 2"
Permanent magnet. 30 VDC.
Tapped holes on front plate
I hope that helps.
Cheers!
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
Edited by - BushWhacker on 30/08/2007 22:26:26 |
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Ralph
Starting Member
Belgium
19 Posts |
Posted - 31/08/2007 : 08:56:22
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BW,
how many times does it have to spin to generate 13v? |
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Del
Junior Member
United Kingdom
369 Posts |
Posted - 31/08/2007 : 09:09:40
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Hi Ralph,
The webpage everyone uses to see the spec's of the various amtek motors is this one
http://www.tlgwindpower.com/ametek.htm
However, I'm pretty sure my Ametek 30 does not produce 30V @ 325 rpm. I'll have to check it and post the results. I've not done it to date for two reasons:
It's accepted worldwide that this is a fine motor to use as a generator and it has a 5/8" shaft that won't fit in my drill chuck.
Cheers
Del. |
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Good Motor
