Greetings all;
This afternoon I unpacked some brass tubing, the same size as what the 38
special laser was made from, and stumbled over a short piece of 3/8 SS
tubing a neighbor had given me after he had redone the fuel lines in a
local race car. So I made a pipe nipple with .5mm threads out
On Thursday 04 October 2018 15:28:52 Ken Strauss wrote:
> I haven't been following this thread so I apologize if this was
> previously noted.
>
> One possible solution to the ball screw whip issue is to spin the
> ballnut rather than the ballscrew. In this scheme the ballscrew does
> not rotate
https://www.youtube.com/watch?v=vETkf1sqo3M=220s
On Thursday, October 4, 2018, 3:41:58 PM MDT, Gregg Eshelman via Emc-users
wrote:
Here's a way to drive the gantry with roller chains. Using fewer changes of
drive is always better since going from a shaft, to worm gear, to rack and
Here's a way to drive the gantry with roller chains. Using fewer changes of
drive is always better since going from a shaft, to worm gear, to rack and
pinion has more places for backlash. The same mechanism as in this video can be
used with lengths of toothed belt.
Roller chain drive Plasma
For a CNC router used primarily for wood and some aluminum I would not consider
anything other than a profile linear bearing such as these for the ways.
https://www.ebay.com/itm/2-sets-HGR25-2000mm-Hiwin-Liner-rail-4-pcs-HGH25CA-Block-Bearing/142629148212?hash=item21355c1634:g:AP0AAOSwfGdbRtAw
Ball screws can be had that long, but they aren't cheap and you're in rotating
nut only territory.
I've bought custom length screws directly from Hiwin for reasonable amounts of
money (a C7 rolled screw and nut cost about half what the machine's OE charges
for a replacement lead screw and so
On Thu, Oct 4, 2018 at 12:48 PM Roland Jollivet
wrote:
> The OP said the table is 3.8m long
>
Yes, a screw is better suited to something about 1.5 meters of under.
Likely best to use a pair of belts, one each side.
How much does a belt tension change with temperature? Normally it is a
The OP said the table is 3.8m long
On Thu, 4 Oct 2018 at 21:35, Chris Albertson
wrote:
> Have you seen the new style ball screws? They are now cheaper then belts
> and have pretty "over kill" specs.
>
> The problem with a 30mm wide belt drive is the need to resist the belt
> tension and
On Thu, Oct 4, 2018 at 12:29 PM Ken Strauss wrote:
>
> One possible solution to the ball screw whip issue is to spin the ballnut
> rather than the ballscrew. In this scheme the ballscrew does not rotate
> and if
> you tension the screw you should be able to use a much smaller diameter
> screw.
>
Have you seen the new style ball screws? They are now cheaper then belts
and have pretty "over kill" specs.
The problem with a 30mm wide belt drive is the need to resist the belt
tension and a way to adjust it. Not only the tension between the two
pulleys but there is side load on the motor
I haven't been following this thread so I apologize if this was previously
noted.
One possible solution to the ball screw whip issue is to spin the ballnut
rather than the ballscrew. In this scheme the ballscrew does not rotate and if
you tension the screw you should be able to use a much
Hello Chris,
I would love to have ballscrews but I thought I would need to large of a
diameter to avoid them to whip. Remember that I have a 3.8 meters in lenght
for the longest joint. I've reading about using anti whip guides that move
with the gantry and also aply tension in the screw with a
The idea of using belts, and gearboxes, and rack and pinions, sounds like a
bad recipe.
While I did suggest a bar across the gantry, the problem is that you're
carrying all those gears, and the motor.
I drew a quick concept sketch of how I would do it. Buy cut-to-length belt,
probably HTD M5 x
On Thu, Oct 4, 2018 at 5:49 AM Leonardo Marsaglia
wrote:
>
>
> About the last question. Is there any disadvantage other than may be a
> little more mechanical complexity with the one motor and shaft approach?
> Because I've seen lots of routers driven with two motors that I almost
> think it's
Well I've been reading the 2.8 Master branch manual about homing and how to
configure two joints for one axis and I think I understand but since I
don't have a Linux PC here to try it out I would like to clarify something.
In the two motors for one axis gantry configuration, does LinuxCNC export
Hi Jon,
Can not find any information but I assume they are PM.
These are Mavilor BL series with resolvers ( BLS )
Bengt
Den 2018-10-04 kl. 18:00, skrev Jon Elson:
On 10/04/2018 07:30 AM, Bengt Sjölund wrote:
Hi folks,
I have several AC servo motors but no drivers, I would like to test
On 10/04/2018 07:30 AM, Bengt Sjölund wrote:
Hi folks,
I have several AC servo motors but no drivers, I would
like to test these to verify that they all work and are OK.
Can I use a VFD to do the testing or will I damage eiher
motors or VFD?
All motors are 3-phase 220VAC and VFD is a
Hello Les,
No, I plan to support 50 mm bars every 600 mm more or less. I'm attaching
some pictures of the design I'm working on. (The adjustable stands for
levelling are not in the assembly because I'm saving resources on this
laptop)
I like the idea of using the rectangular ways but
Hello Dave,
Well, to avoid the backlash is that or may be using timing belts and
pulleys to drive the shaft too. The gearbox is a good idea but I think that
can raise the cost too much. Anyway I'll give it a look because I don't
want to discard any option.
In any case I'm still not sure about
I'd avoid a worm gear drive. They are prone to wear and backlash.
I'd look for a good deal on a servo grade planetary 10:1 gearbox that
fits your Chinese motor.
Probably the easiest and most rigid drive solution is to use two motors
each with a planetary gear box and direct drive a pinion on
By the way, on the pictures there are missing details I didn't draw yet,
like setscrews for parallel regulation and things like that. Also, I have
yet to modify the design for the one motor and shaft approach and see wich
is better.
El jue., 4 oct. 2018 a las 11:37, Leonardo Marsaglia ()
You need to keep the drive system as simple as possible and keep
backlash in mind.
Also, don't forget about the spring constant of any shaft you run across
the gantry. If you do that, you might want to
run a tube drive shaft rather than a solid shaft for more torsional
rigidity.
There is
Hi Andy,
Well it is a bigIF for one STMBL ;) Do you have one to spare?
These are fitted with resolvers so STMBL would be nice.
I have 7 motors to be checked.
VFD test might reveal if there is some mechanical issues such as bearings.
Cheers
Bengt
Den 2018-10-04 kl. 15:26, skrev andy pugh:
On
Using two motors is mechanically simpler and has lower rotational
inertia but I am not a fan of this setup. If you use a tube rather than
a solid shaft, you won't add a lot of inertia. I'm thinking of building
another plasma cutter and it will probably use a shaft rather than 2 motors.
But
On 10/04/2018 07:30 AM, Bengt Sjölund wrote:
Hi folks,
I have several AC servo motors but no drivers, I would like to test
these to verify that they all work and are OK.
Can I use a VFD to do the testing or will I damage eiher motors or VFD?
All motors are 3-phase 220VAC and VFD is a
On Thu, 4 Oct 2018 at 13:32, Bengt Sjölund wrote:
> I have several AC servo motors but no drivers, I would like to test
> these to verify that they all work and are OK
What do you want to test?
The VFD probably won't do any harm but won't tell you much about the
encoder/resolver.
If you can
Hi folks,
I have several AC servo motors but no drivers, I would like to test
these to verify that they all work and are OK.
Can I use a VFD to do the testing or will I damage eiher motors or VFD?
All motors are 3-phase 220VAC and VFD is a single-phase 230VAC input so
0 to 230 3-phase
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