Posted: Tue Jan 31, 2012 9:17 pm
Can anyone else see them?
Forum for discussion of television and imaging using mechanical, radio, and early electronic systems.
https://www.taswegian.com/NBTV/forum/
https://www.taswegian.com/NBTV/forum/viewtopic.php?f=1&t=1486
gary wrote:Can anyone else see them?
gary wrote:Yes it works now Harry - thanks - it is all looking good I must say.
I've always found it annoying that CD/DVD drums have a taper, or conical shape, they would be so much more useful if they were cylindrical - I wonder why they do that? Stacking perhaps? Or maybe it is easier to manufacture them that way.
Yes Harry, I believe it is possible to use a stepper as a galvanometer. I ran to my newsletter CD because I thought I remembered the NBTV laser "guru" Colin Hopper using them as such (V27.4), alas he also has only heard of them being used as such. Note that an ordinary DC motor may also be used that way - as used in many a cheap laser light show kit.
I should also mention, for what it is worth, that if you could find a stepper motor with a step angle of 22.5 degrees you could run it at 750 RPM from a mains derived (through a transformer) signal with just a single capacitor. If you could find a 45 degree stepper you could run it at 1500 RPM.
I have never seen such a stepper, but Harry, you are such a good "scrounger" maybe you will find one. If you do, save one for me!
AncientBrit wrote:Harry,
Where do you purchase the 'Meccano' perforated strip?
Looks like it makes mechanical construction quick and neat,
Graham
gary wrote:Or maybe it is easier to manufacture them that way.
gary wrote:Well you can be proud of the look of this one Harry, it's looking great.
On the subject of hardware stores, have you been to one of the Masters stores? (not up here yet). I am hoping that they will have a greater range of things we are interested in since they are part owned by the US Lowes organisation. In particular I would like it confirmed they are stocking Poplar timber and other varieties other than Pinus Crapiata (you know that stuff Bunnings sells that is full of knots, holes, and is bent like a boomerang).
harry dalek wrote:Masters i don't think we have those in Melbourne mmmmm i will have to google .
harry dalek wrote:do you go to the bunnings in warrawong?
gary wrote:harry dalek wrote:Masters i don't think we have those in Melbourne mmmmm i will have to google .
My understanding is that is where they have opened first:
http://www.insideretailing.com.au/IR/IR ... -2213.aspxharry dalek wrote:do you go to the bunnings in warrawong?
No, Mittagong is closer.
I have Home Hardware and Magnet Mart available to me as well.