Cyril, Thank you for the reply. I had been thinking about a circular rule, but that is as far as it had gone. I wasn't aware that Concise had beaten me to it! ...
41124
dieswartdose
Aug 1, 2011 10:19 am
Stefan, Many thanks for the info. I appreciate that the frequency range could be huge, but I suspected that your interest was the audible frequency range. You...
41125
Bill Robinson
gerwkr
Aug 1, 2011 10:19 am
Steve: Thank you. My comment about it being "scary" now applys to your reference to "evolution". What is happening to the schools? Maybe it has always been...
41126
ken osborn
keorebel
Aug 1, 2011 10:19 am
Uh, was this a Saturday Night Live spoof? If not, then Orwellian is an understatement! And the only contestant who questioned the question was the only one...
41127
Cyril Catt
newcastleewc...
Aug 1, 2011 1:05 pm
Peter Johnson wrote: ...I had been thinking about a circular rule, but that is as far as it had gone. … Sorry Peter, I beat you to it. Having been annoyed at...
41128
waltershawlee
Aug 1, 2011 4:28 pm
We just had another 50K/100K visitor hit our site: http://www.sphere.bc.ca/test/sruniverse.html this was Michele T. Mazzucato from Italy, congratulations, your...
41129
dieswartdose
Aug 2, 2011 1:57 am
Nothing new under the Sun, they say! As a schoolboy, I too coveted a circular slide rule for the same reason. Some 50-odd years later my wish came true when I...
41130
dspr743
Aug 2, 2011 1:57 am
Back a while ago I had posted some ideas, and requested advice on constructing slide rules. The best advice at the time was to acquire some used slide rules,...
41131
eriphila
Aug 2, 2011 1:57 am
I found this at a shop and it's not quite what I thought at first: http://4.bp.blogspot.com/-2ysxJ8CBj6A/TjYKlDJwnDI/AAAAAAAAAkw/CehXsw8WkUY/s1600/scan0302.jpg...
41132
jlfose
Aug 2, 2011 1:57 am
Just trying to blend some hobbies. I know that there have been a lot of paper, cardboard or thin plastic guitar cord sliderules that have been produced over...
41133
Maynard Wright
mngwright
Aug 2, 2011 2:44 am
I've used a little talcum powder in my circular rules with success. Maynard Wright...
41134
Paul Anderson
paul@...
Aug 2, 2011 2:54 am
I've been kicking around the idea of manufacturing slide rules. The idea I had for making the scales was to laser engrave anodised aluminum. This opens...
41135
Robert
radamspse
Aug 2, 2011 3:35 am
You could try this one Jlfose http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=190560672158...
41136
dspr743
Aug 2, 2011 3:36 am
I've been told that the problem with laser engraving is that the laser beam is too wide to properly imprint the 4 - 6 point font needed for most of the scale...
41137
Hugh Aguilar
hughaguilar96
Aug 2, 2011 5:37 am
You can't laser engrave aluminum! You can use a laser to char wood. This would work for DSPR743's plan of making the slide-rule out of wood. He could get a ...
41138
jlfose
Aug 2, 2011 5:38 am
Thanks Robert! That looks just right. I've contacted the seller to see if they will ship to the USA. Jeff...
41139
dieswartdose
Aug 2, 2011 1:09 pm
Maynard, Thank you for that tip - I'll give it a try. Regards, Peter Johnson...
41140
Maynard Wright
mngwright
Aug 2, 2011 3:55 pm
... Hi, Ron, I don't know who might have used the 1084, but it would probably have been the independent companies who didn't have direct access to Bell System...
41141
Paul Anderson
paul@...
Aug 2, 2011 7:59 pm
I don't believe that applies to modern lasers. The Epilog Zing is capable of a resolution of 1000dpi, which is more than enough to produce a 6 point typeface. ...
41142
Paul Anderson
paul@...
Aug 2, 2011 7:59 pm
You can laser engrave *anodized* aluminum just fine. Epilogs materials list for their Zing series laser: http://www.epiloglaser.com/zing_materials.htm ...
41143
William Brohinsky
onlyocelot
Aug 2, 2011 11:05 pm
... Really? I suppose my employer have been fooling themselves all these years. Do you think I should tell them? Yes, it is difficult to laser-engrave, etch or...
41144
Hugh Aguilar
hughaguilar96
Aug 2, 2011 11:05 pm
Well, if a laser can take the anodization off of aluminum, then that is great. It was about 15 years ago when I was working with lasers, so maybe they have ...
41145
Sean Sanderson
kd6mpy
Aug 2, 2011 11:38 pm
All, Not sure of the precision involved, but my jeweler can engrave on pretty much every surface. He was telling me that he used his laser engraver to put a...
41146
Paul Anderson
paul@...
Aug 2, 2011 11:38 pm
... Ahh, that explains it. The technology has improved enormously since then. It's like night and day, not just in performance but also in cost. As for laser...
41147
Robert Wolf
c5609938
Aug 3, 2011 1:05 am
How about engraving on plastic? Would this be easier? Anyway, if anyone starts making sliderules I would consider a purchase. Cheers, Robert...
41148
William Brohinsky
onlyocelot
Aug 3, 2011 1:07 am
The Epilog at my college has a 45W laser. I burned one of the sliderule graphics into a sheet of PTFE, just to see a) what it would come out like, and b) how...
41149
Hugh Aguilar
hughaguilar96
Aug 3, 2011 1:08 am
In regard to the speed of the laser etcher, that depends primarily upon the motion-control board. The company that I worked for, Testra, built these ...
41150
Paul Anderson
paul@...
Aug 3, 2011 2:14 am
... I've been debating back and forth the best technique. I *do* have a small CNC mill that is suitable for engraving. Making the tongue and groove on a mill...
41151
Stefan Vorkoetter
smvorkoetter
Aug 3, 2011 2:14 am
... I think onesies and twosies is all you'd be selling. I don't think there's a big market for slide rules. -- Stefan Vorkoetter http://www.stefanv.com...
41152
William Brohinsky
onlyocelot
Aug 3, 2011 2:14 am
Many of these questions are addressed (without reference to slide rules) in the Active Filter Cookbook by Don Lancaster. It's worth a read, especially because...
