Simple Linear Motion?
Simple Linear Motion?
(OP)
I'm building a bench top reactor setup and I'd like to have my reactors oscillate up and down in a temperature bath. Does anyone know, specifically, what I can use that's simple/inexpensive to set up and will create continuous push/pull motion (mounted vertically)?
I need a stroke of about 5.5" and a slow speed (less than 1"/second). The load I have is about 5-6 lbs, not much. I've looked at several things - linear slides, motors, actuators - but I'm just not familiar enough to know what to choose.
I'd appreciate any help along the lines of what exactly I need to look for, where, how to configure, etc. if anyone can offer it.
Thanks!
I need a stroke of about 5.5" and a slow speed (less than 1"/second). The load I have is about 5-6 lbs, not much. I've looked at several things - linear slides, motors, actuators - but I'm just not familiar enough to know what to choose.
I'd appreciate any help along the lines of what exactly I need to look for, where, how to configure, etc. if anyone can offer it.
Thanks!





RE: Simple Linear Motion?
RE: Simple Linear Motion?
Hope this helps.
saxon
RE: Simple Linear Motion?
Ray Reynolds
"Computers in the future may weigh no more than 1.5 tons."
Popular Mechanics, forecasting the relentless march of science, 1949
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RE: Simple Linear Motion?
RE: Simple Linear Motion?
ChemE, M.E. EIT
"The only constant in life is change." -Bruce Lee
RE: Simple Linear Motion?
rmw
RE: Simple Linear Motion?
If we make a quick calc of your power requierements we find:
Load: 6 lbs
Speed: 1"/sec = 60"/min = 5'/min or 5 fpm
Then you requiere: 6 lbs x 5 fpm = 30 lb-ft/min
Since 1 HP = 33,000 lb-ft/min then we have:
30 ft-lb/min / 33,000 lb-ft/min = 1/1000 HP net power use so you will find that almost the smalest motor-reducer combination that turns a crank with 2.75" excentricity will do the work for you.
As a crank that gives you the 5.5" stroke will move 11" in one revolution (5.5" down + 5.5" up) and you want a linear speed of 1"/sec then you have 11 sec/rev which gives you about 5.5 RPM output speed for your reducer with an input power of 1/1000 HP.
Since the power involved is so little you might get along with a simple disk attached to the output shaft of the reducer a journal drilled and tapped to the disk (a simple 3/8" NC bolt should do) with a rod that should be about 16" long and a 6" slider so the swinging motion of the rod is turned into a simple linear motion. Any small shop should have the facilities for making such a device and should be cheap also.
Cheers
SACEM1
RE: Simple Linear Motion?
Regards,
JP
RE: Simple Linear Motion?
<nbucska@pcperipherals DOT com> subj: eng-tips
RE: Simple Linear Motion?
It is a simple ___--___ crank.
<nbucska@pcperipherals DOT com> subj: eng-tips
RE: Simple Linear Motion?
m777182