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Turntable?

  • Thread starter Dirk Bruere at NeoPax
  • Start date
D

Dirk Bruere at NeoPax

Jan 1, 1970
0
G

GregS

Jan 1, 1970
0
I'm looking for a cheap method of spinning a (small) bit of apparatus at
frequencies between 0.5Hz and 10Hz. The lower end is not a problem - I
could use a 33rpm turntable for example. However, I'd like something
with a speed controller. The mass of the apparatus is typically less
than 500g. Any ideas?


Some turntables fed off a variable frequency power amp. The frequencies
just jumped, instead of slewing. Other than a servo unit, I think a simple
DC motor with a gear or belt drive would do it.

greg
 
D

Dirk Bruere at NeoPax

Jan 1, 1970
0
GregS said:
Some turntables fed off a variable frequency power amp. The frequencies
just jumped, instead of slewing. Other than a servo unit, I think a simple
DC motor with a gear or belt drive would do it.

greg

That's what I thought, but I was hoping someone somewhere sold such an
item cheaply, probably for other uses.

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.onetribe.me.uk/wordpress/?cat=5 - Our podcasts on weird stuff
 
G

GregS

Jan 1, 1970
0
That's what I thought, but I was hoping someone somewhere sold such an
item cheaply, probably for other uses.

The stirrer plates used in labs are too fast and not enough torque.
Look in the Jameco catalog under gearmotors. You shold be able to grab a large
diameter hub somewhere.

greg
 
I'm looking for a cheap method of spinning a (small) bit of apparatus at
frequencies between 0.5Hz and 10Hz. The lower end is not a problem - I
could use a 33rpm turntable for example. However, I'd like something
with a speed controller. The mass of the apparatus is typically less
than 500g. Any ideas?

Go to a hobby shop and check out the selection of Tamiya gearbox kits.
There might be something there of interest.
 
R

Rich Grise

Jan 1, 1970
0
I'm looking for a cheap method of spinning a (small) bit of apparatus at
frequencies between 0.5Hz and 10Hz. The lower end is not a problem - I
could use a 33rpm turntable for example. However, I'd like something with
a speed controller. The mass of the apparatus is typically less than 500g.
Any ideas?

Potter's wheel?
http://images.google.com/images?hl=en&q="potter's+wheel"&btnG=Search+Images&gbv=1

Weld positioner?
http://images.google.com/images?gbv=1&hl=en&q="weld+positioner"&btnG=Search+Images

Have Fun!
Rich
 
D

Dirk Bruere at NeoPax

Jan 1, 1970
0
Rich said:

Possibly potter's wheel.
I'll check prices, but need a speed controller.
Maybe the model shop gearbox the netzero guy suggested.

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.onetribe.me.uk/wordpress/?cat=5 - Our podcasts on weird stuff
 
C

Carl Ijames

Jan 1, 1970
0
That's 30 to 600 rpm. Chuck it in a variable speed hand drill, the kind
where the trigger pull controls speed and it has a set screw on the trigger
to make it reproducible, or take a small dc muffin fan and run it off a
variable dc supply (cut off the blades if they bother you). We used the
muffin fan idea back in school, with a small glass plate glued on the hub to
put grinding paste on, to polish the ends of glass fibers. If you need
faster chuck it into a dremel tool, but they go up to 6-12000 rpm so the low
end speed control is very coarse.
 
M

mpm

Jan 1, 1970
0
I'm looking for a cheap method of spinning a (small) bit of apparatus at
frequencies between 0.5Hz and 10Hz. The lower end is not a problem - I
could use a 33rpm turntable for example. However, I'd like something
with a speed controller. The mass of the apparatus is typically less
than 500g. Any ideas?

Option-1: Gerbils. ?
Plus, a supply of other Gerbils injected with varying doses of
testosterone. ?

Sorry. Let me put my weekend serious cap on:
One of my standup drill presses uses a two-pulley system (multiple
diameters).
Adjusting the belts changes the speed and torque.
Also, what about a microwave oven turntable? Can you do anything with
that?

-mpm
 
D

Dirk Bruere at NeoPax

Jan 1, 1970
0
Carl said:
That's 30 to 600 rpm. Chuck it in a variable speed hand drill, the kind
where the trigger pull controls speed and it has a set screw on the trigger
to make it reproducible, or take a small dc muffin fan and run it off a
variable dc supply (cut off the blades if they bother you). We used the
muffin fan idea back in school, with a small glass plate glued on the hub to
put grinding paste on, to polish the ends of glass fibers. If you need
faster chuck it into a dremel tool, but they go up to 6-12000 rpm so the low
end speed control is very coarse.

Cheap mains fan with an added speed controller.
Would a dimmer switch work, or is the load too inductive?
Maybe an auto transformer?

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.onetribe.me.uk/wordpress/?cat=5 - Our podcasts on weird stuff
 
D

Dirk Bruere at NeoPax

Jan 1, 1970
0
mpm said:
Option-1: Gerbils. ?
Plus, a supply of other Gerbils injected with varying doses of
testosterone. ?

Sorry. Let me put my weekend serious cap on:
One of my standup drill presses uses a two-pulley system (multiple
diameters).
Adjusting the belts changes the speed and torque.
Also, what about a microwave oven turntable? Can you do anything with
that?

-mpm

Too slow probably.
And my oven is still working, despite all the graunching noises from the
turntable.

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.onetribe.me.uk/wordpress/?cat=5 - Our podcasts on weird stuff
 
K

K Ludger

Jan 1, 1970
0
R

Rich Grise

Jan 1, 1970
0
mpm wrote: ....

Too slow probably.
And my oven is still working, despite all the graunching noises from the
turntable.

Microwave ovens are free, if you know where to dumpster-dive. ;-)

Cheers!
Rich
 
J

JosephKK

Jan 1, 1970
0
I'm looking for a cheap method of spinning a (small) bit of apparatus at
frequencies between 0.5Hz and 10Hz. The lower end is not a problem - I
could use a 33rpm turntable for example. However, I'd like something
with a speed controller. The mass of the apparatus is typically less
than 500g. Any ideas?

I have several ideas based around variable speed hobby motor /
controller combinations.
 
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