Hi
I thing we uncovered all potential problem for slow speed machine.
Here a will use more refined numbers and it looks more close to real
situation.
Minimum counts to controller about 30 pulses per second.
Or 1800 counts per minute.
One revolution is 8192 pulses.
So, per minute I will have
Is there some reason why simple worm and wheel drives won't work here -
even two or three stages with backlash adjusted out?
Ian
Ian W. Wright
Sheffield UK
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look design of harmonic derive. it is compact and small. you do not want
to have huge gear reduction box on the machines. space are limited too.
Is there some reason why simple worm and wheel drives won't work here -
even two or three stages with backlash adjusted out?
Ian
I think you should consider building a simple test slide, with guides, ball
screw, servo, and a simple timing belt and pulley reduction.
That way you can try different reduction ratios and encoder resolutions and
measure the speeds you can get and how smooth the motion is.
I think you will find
It is my understanding that in a grinding machine:
1 -- Cutting forces are low.
2 -- Backlash is generally not important.
3 -- Smoothness of motion is very important.
I would suggest that before you worry about how to drive the components
in slow motion, you should tell us how you plan to
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, May 22, 2008 9:36 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Harmonic gear and EMC2.
Machine make up to 1 inch in diameter and 6 inch long
travel at feed 0.001 will be geometry of 1 inch end mill, with length of
end mill 4 inch. 0.001 /min it is cutting feed only. rapid to new position
will be much faster.
It is my understanding that in a grinding machine:
1 -- Cutting forces are low.
2 -- Backlash is generally not important.
A simple solution is to use a dual drive.
Use a course mechanism with long travel for course positioning and a
fine mechanism with limited travel for fine positioning. The fine
mechanism has a large mechanical advantage and can use a smaller motor
and driver. Of course, some sort of clutch
Kenneth Lerman wrote:
A simple solution is to use a dual drive.
Use a course mechanism with long travel for course positioning and a
fine mechanism with limited travel for fine positioning. The fine
mechanism has a large mechanical advantage and can use a smaller motor
and driver. Of
Good thinking Ken. Till built a dual drive sort of thing several years
ago to test some special kinematics.
http://www.audiflitzer.de/mixer.html
HTH
Rayh
On Fri, 2008-05-23 at 14:57 -0400, Kenneth Lerman wrote:
A simple solution is to use a dual drive.
Use a course mechanism with long
] Harmonic gear and EMC2.
Good thinking Ken. Till built a dual drive sort of thing several years
ago to test some special kinematics.
http://www.audiflitzer.de/mixer.html
HTH
Rayh
I wonder if a Piezoelectric actuator could be used for the fine motion? They
seem to go up to a few mills
John Kasunich wrote:
Kenneth Lerman wrote:
A simple solution is to use a dual drive.
Use a course mechanism with long travel for course positioning and a
fine mechanism with limited travel for fine positioning. The fine
mechanism has a large mechanical advantage and can use a smaller motor
I am building CNC tool grinder.
The feed for tool grinder should be from 0.00025 to 0.001 of the inch per
minute.
The servo motor must perform at this feed perfect to make a good grinding
job.
I will use direct drive and my ball screw has 5 pitch per inch.
So talking in degrees, 5 times 360 =
On Thu, 2008-05-22 at 19:59 -0600, [EMAIL PROTECTED] wrote:
my ball screw has 5 pitch per inch.
What are the specifications of that screw and nut?
Rayh
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Defy all
I bought everything from company that represent company from Taiwan, and
it is 20 mm in OD and pitch 5 mm. that screw only as a demo to show how
slow it can go. Real machine will have much larger OD of ball screw.
aram
On Thu, 2008-05-22 at 19:59 -0600, [EMAIL PROTECTED] wrote:
my ball screw
Hi Aram
I don't think it's the diameter that's important (unless the forces on
the screw will be very high). The important specs have to do with screw
pitch error, preload on the ballnut, and also the end bearings. A good
screw will have maybe 0.001 error over 1 foot, the best I saw with a
: [Emc-users] Harmonic gear and EMC2.
I am building CNC tool grinder.
The feed for tool grinder should be from 0.00025 to 0.001 of the inch per
minute.
The servo motor must perform at this feed perfect to make a good grinding
job.
I will use direct drive and my ball screw has 5 pitch per inch
22, 2008 6:59 PM
To: Enhanced Machine Controller (EMC)
Cc: emc-users@lists.sourceforge.net
Subject: [Emc-users] Harmonic gear and EMC2.
I am building CNC tool grinder.
The feed for tool grinder should be from 0.00025 to 0.001 of the inch per
minute.
The servo motor must perform
accuracy of machine is important but feed should be low enough to grinding
wheel can do the job. grinding of solid carbide is slow process. screw may
be 0.005 inaccuracy but feeding need be very slow to do the grinding.
aram
Hi Aram
I don't think it's the diameter that's important (unless the
i forgot to say that all good grinding machine have linear incoder or
scale alog a axis so inaccuracy of ball screw will not effect final out
put of servomotor.
am i right?
Hi Aram
I don't think it's the diameter that's important (unless the forces on
the screw will be very high). The
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