On Monday 03 May 2021 22:52:13 Jon Elson wrote:
> On 05/03/2021 07:35 PM, Gene Heskett wrote:
> > Thanks Jon, I hadn't thought of it in that exact manner, and it
> > makes perfect sense. So I'll likely give it a shot in the next few
> > days.
> >
> > Does there seem to be a golden ratio that
Den 2021-05-04 kl. 01:22, skrev Jon Elson:
On 05/03/2021 12:03 PM, Nicklas SB Karlsson wrote:
Den 2021-05-03 kl. 17:42, skrev Jon Elson:
Assuming machine is lubricated there shear force in oil/grease depend
on speed so it might actually be rather close to viscous friction and
hence rather
On 05/03/2021 07:35 PM, Gene Heskett wrote:
Thanks Jon, I hadn't thought of it in that exact manner, and it makes
perfect sense. So I'll likely give it a shot in the next few days.
Does there seem to be a golden ratio that works well consistently?
Some people seem to have a feel for the
On Monday 03 May 2021 19:25:48 Jon Elson wrote:
> On 05/03/2021 02:34 PM, Gene Heskett wrote:
> > Friction will of coarse vary, but assume the amplitude of
> > the jitter is constantly reset to zero by a passing edge
> > from the encoder, but it times out in 2 millisecs. Leaving
> > the pwmgen
On 05/03/2021 02:34 PM, Gene Heskett wrote:
Friction will of coarse vary, but assume the amplitude of
the jitter is constantly reset to zero by a passing edge
from the encoder, but it times out in 2 millisecs. Leaving
the pwmgen outputing a very low duration pulse in one
direction or the
On 05/03/2021 12:03 PM, Nicklas SB Karlsson wrote:
Den 2021-05-03 kl. 17:42, skrev Jon Elson:
Assuming machine is lubricated there shear force in
oil/grease depend on speed so it might actually be rather
close to viscous friction and hence rather close to
linear. Then an oil/grease pump is
On Monday 03 May 2021 11:42:54 Jon Elson wrote:
> On 05/03/2021 02:57 AM, Gene Heskett wrote:
> > More specifically, which of the F's is suitable for forcing a closer
> > to null settling point when there is considerable friction in the
> > system?
>
> That's the problem! Friction is nonlinear,
Den 2021-05-03 kl. 17:42, skrev Jon Elson:
On 05/03/2021 02:57 AM, Gene Heskett wrote:
More specifically, which of the F's is suitable for forcing a closer to
null settling point when there is considerable friction in the system?
That's the problem! Friction is nonlinear, and it hurts during
On 05/03/2021 02:57 AM, Gene Heskett wrote:
More specifically, which of the F's is suitable for forcing a closer to
null settling point when there is considerable friction in the system?
That's the problem! Friction is nonlinear, and it hurts
during acceleration but HELPS during deceleration.
On Sunday 02 May 2021 21:02:29 Gene Heskett wrote:
> On Sunday 02 May 2021 16:34:43 Jon Elson wrote:
> > On 05/02/2021 01:00 PM, Chris Albertson wrote:
> > > The below is exactly true. The problem is that PID is widely used
> > > and PID is only "reactive" it can only deal with what has already
On Sunday 02 May 2021 16:34:43 Jon Elson wrote:
> On 05/02/2021 01:00 PM, Chris Albertson wrote:
> > The below is exactly true. The problem is that PID is widely used
> > and PID is only "reactive" it can only deal with what has already
> > happened and the time lag is the source of
A well-tuned PID with feedforward is capable of controlling a machine tool
without any issues. Sure there are better ways to implement a control, but
the results are not going to be significantly different on something as
simple as a machine tool. After the academic controls community played
On 05/02/2021 01:00 PM, Chris Albertson wrote:
The below is exactly true. The problem is that PID is widely used and PID
is only "reactive" it can only deal with what has already happened and the
time lag is the source of oscillations.In the past, PID was the only
control option because we
Den 2021-05-02 kl. 20:00, skrev Chris Albertson:
The below is exactly true. The problem is that PID is widely used and PID
is only "reactive" it can only deal with what has already happened and the
time lag is the source of oscillations.In the past, PID was the only
control option because
The below is exactly true. The problem is that PID is widely used and PID
is only "reactive" it can only deal with what has already happened and the
time lag is the source of oscillations.In the past, PID was the only
control option because we had limited computing power. People are
On Sunday 02 May 2021 09:29:09 dave engvall wrote:
> Hi Gene,
>
> Your comments on the servo-stepper are interesting. How well would
> they drive a BP sized mill?
I can't think of a GOOD reason, other than the mass of the knee would
probably need some belt reduction in the knee. 3NM is in the
On Saturday 01 May 2021 12:34:01 Chris Albertson wrote:
> Gene,
>
> I did a search on the part number to gave and, they look really good
> but cost $400 per axis vs about $60 for what I have. Yes, they are
> much better.Did you find a better deal?
>
Egad, where are you looking? 6 months ago
Where did you end up getting your motors and what are
> > you using for drivers?
> >
> > -Original Message-
> > From: Gene Heskett
> > Sent: April 30, 2021 10:45 PM
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] Maybe a minimally prin
John. I love the Chinese servos too.
And totally agree going direct to manafacture is much better.
I buy my servos with absolute encoders now.
130 ppr I think. Or might be 13.
Just a basic 750w servo 220v servo drive plus motor costs me about $220 usd
last I checked. (this is with
ne Heskett
> Sent: April 30, 2021 10:45 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
>
> On Monday 22 March 2021 09:19:19 Sam Sokolik wrote:
>
> > 202,200 for the outside spline and the flex gear is 200
> From: Chris Albertson [mailto:albertson.ch...@gmail.com]
> To: Enhanced Machine Controller (EMC)
> Gene,
>
> I did a search on the part number to gave and, they look really good but
> cost $400 per axis vs about $60 for what I have. Yes, they are much
> better.Did you find a better deal?
Gene,
I did a search on the part number to gave and, they look really good but
cost $400 per axis vs about $60 for what I have. Yes, they are much
better.Did you find a better deal?
Question for the group:
Assuming that you need about 3NM holding torque, what will $400 get you if
you want
On Saturday 01 May 2021 08:35:12 Thaddeus Waldner wrote:
> So these are actual stepper motors and not 3-phase BLDC motors with
> step/direction input?
yes, and while I said a step loss will stop them it has to exist for an
unspecified time frame. You can fasten them down, put a vice grip on the
nt
> in stepper technology.
>
>> -----Original Message-
>> From: Gene Heskett
>> Sent: April 30, 2021 10:45 PM
>> To: emc-users@lists.sourceforge.net
>> Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
>>
>>> On Monday 22 March 2021 09:19:
: April 30, 2021 10:45 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
>
> On Monday 22 March 2021 09:19:19 Sam Sokolik wrote:
> > 202,200 for the outside spline and the flex gear is 200. In this
> > situation - the 202 tooth splin
you
using for drivers?
-Original Message-
From: Gene Heskett
Sent: April 30, 2021 10:45 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
On Monday 22 March 2021 09:19:19 Sam Sokolik wrote:
> 202,200 for the outside spline and
On Monday 22 March 2021 09:19:19 Sam Sokolik wrote:
> 202,200 for the outside spline and the flex gear is 200. In this
> situation - the 202 tooth spline is stationary to the stepper. The
> 200 tooth outside spline is mounted to the faceplate. In this layout
> - the ratio apears to be 101:1
>
https://www.youtube.com/watch?v=JSDu81jjYFs
On Mon, Mar 29, 2021 at 10:23 PM Sam Sokolik wrote:
> ^ thanks andy.
>
> On Mon, Mar 29, 2021 at 10:23 PM Sam Sokolik wrote:
>
>> http://electronicsam.com/images/greenmachine/IMG_20210329_220745.jpg
>>
>> On Sun, Mar 28, 2021 at 5:17 PM Sam Sokolik
^ thanks andy.
On Mon, Mar 29, 2021 at 10:23 PM Sam Sokolik wrote:
> http://electronicsam.com/images/greenmachine/IMG_20210329_220745.jpg
>
> On Sun, Mar 28, 2021 at 5:17 PM Sam Sokolik wrote:
>
>> have not done any destructive testing - but finally grabbed an oem650
>> drive so I can have
http://electronicsam.com/images/greenmachine/IMG_20210329_220745.jpg
On Sun, Mar 28, 2021 at 5:17 PM Sam Sokolik wrote:
> have not done any destructive testing - but finally grabbed an oem650
> drive so I can have full 4 axis to play with. Seems to run the rotary
> atleast as good as the
have not done any destructive testing - but finally grabbed an oem650 drive
so I can have full 4 axis to play with. Seems to run the rotary atleast as
good as the leadshine.
http://electronicsam.com/images/greenmachine/IMG_20210328_165552.jpg
On Wed, Mar 24, 2021 at 8:36 AM Sam Sokolik wrote:
I have a cheap chuck that is held on with 3 cap head screws. My plan is to
make a disk that registers the center of the faceplate and the inside lip
of the chuck. - I don't remember the exact size.. about 4.5"
On Tue, Mar 23, 2021 at 9:48 PM John Dammeyer
wrote:
>
>
> > From: Sam Sokolik
> From: Sam Sokolik [mailto:samco...@gmail.com]
> http://electronicsam.com/images/greenmachine/IMG_20210321_133551.jpg
>
So Sam,
What's the diameter of the faceplate?
And are you planning on mounting a chuck onto it?
If so, all the front mount ones still need some sort of registration
ses the direction is the same? Like in real life?
>
> > -Original Message-
> > From: Sam Sokolik [mailto:samco...@gmail.com]
> > Sent: March-22-21 9:48 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Maybe a minimally printed
In both cases the direction is the same? Like in real life?
> -Original Message-
> From: Sam Sokolik [mailto:samco...@gmail.com]
> Sent: March-22-21 9:48 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
&
t; John
>
> > -Original Message-
> > From: Sam Sokolik [mailto:samco...@gmail.com]
> > Sent: March-22-21 6:19 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
> >
> > 202,200 for the out
h-22-21 6:19 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
>
> 202,200 for the outside spline and the flex gear is 200. In this situation
> - the 202 tooth spline is stationary to the stepper. The 200 tooth outside
> s
On Monday 22 March 2021 09:19:19 Sam Sokolik wrote:
> 202,200 for the outside spline and the flex gear is 200. In this
> situation - the 202 tooth spline is stationary to the stepper. The
> 200 tooth outside spline is mounted to the faceplate. In this layout
> - the ratio apears to be 101:1
>
On Mon, 22 Mar 2021 at 13:23, Sam Sokolik wrote:
> I am sure Andy can explain it. It doesn't make sense to me.
It's because there is an extra 1-tooth movement of the spline with the
moving gear.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial
wow - lets try that again... Must be too early
202,200 for the outside spline and the flex gear is 200. In this situation
- the 200 tooth spline is stationary to the stepper. The 202 tooth outside
spline is mounted to the faceplate. In this layout - the ratio apears to
be 101:1
In this
202,200 for the outside spline and the flex gear is 200. In this situation
- the 202 tooth spline is stationary to the stepper. The 200 tooth outside
spline is mounted to the faceplate. In this layout - the ratio apears to
be 101:1
In this situation the stepper motor and the face plate spin
> From: Sam Sokolik [mailto:samco...@gmail.com]
> So. interesting.. I just swapped the gears.. Before my ratio was
> 100:1. Input scale was 1600step/rev * 100 = 16/360 = 444.444
> input scale.
>
> Now I reversed the outside splines. I thought - wow - I must be losing
>
So. interesting.. I just swapped the gears.. Before my ratio was
100:1. Input scale was 1600step/rev * 100 = 16/360 = 444.444
input scale.
Now I reversed the outside splines. I thought - wow - I must be losing
steps - but i would aways come back to zero. Finally though -
On Sun, 21 Mar 2021 at 20:21, Viesturs Lācis wrote:
> I do not understand, how to get equal pitch diameter with different
> number of teeth...
You can shift the profile of gear teeth. You can add an extra couple
of teeth, which moves more of the tooth above the pitch circle, or
remove a couple
On Sunday 21 March 2021 16:16:59 Viesturs Lācis wrote:
> otrd., 2021. g. 26. janv., plkst. 19:26 — lietotājs andy pugh
>
> () rakstīja:
> > You have two internally toothed gears and a double-height
> > flex-spline. The gears have 202 and 200 teeth, the flex-spline has
> > 200.
> > That means that
otrd., 2021. g. 26. janv., plkst. 19:26 — lietotājs andy pugh
() rakstīja:
>
> You have two internally toothed gears and a double-height flex-spline.
> The gears have 202 and 200 teeth, the flex-spline has 200.
> That means that the flex-spline is static relative to the 200 tooth
> gear, but moves
sage-
> > From: Sam Sokolik [mailto:samco...@gmail.com]
> > Sent: March-21-21 11:46 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
> >
> > http://electronicsam.com/images/greenmachine/IMG_20210
Does a chuck also fit onto that?
Still trying to decide what to do with mine.
John Dammeyer
> -Original Message-
> From: Sam Sokolik [mailto:samco...@gmail.com]
> Sent: March-21-21 11:46 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Maybe a mi
http://electronicsam.com/images/greenmachine/IMG_20210321_133551.jpg
On Sat, Mar 20, 2021 at 2:44 PM Gene Heskett wrote:
> On Saturday 20 March 2021 14:52:51 Sam Sokolik wrote:
>
> > Currently I am using Vaseline... The black is plastic wear...
> >
> Humm, I've heard its not recommended, as
On Saturday 20 March 2021 14:52:51 Sam Sokolik wrote:
> Currently I am using Vaseline... The black is plastic wear...
>
Humm, I've heard its not recommended, as it's petroleum based. I won't
have that wear evidence though, this Dremel 3d45 came with clear PETG,
and although I've two spools of
Currently I am using Vaseline... The black is plastic wear...
On Sat, Mar 20, 2021, 1:43 PM Gene Heskett wrote:
> On Saturday 20 March 2021 09:57:11 Sam Sokolik wrote:
>
> > 36 hours - For this purpose I think we are good.
> >
> >
On Saturday 20 March 2021 09:57:11 Sam Sokolik wrote:
> 36 hours - For this purpose I think we are good.
>
> http://electronicsam.com/images/greenmachine/IMG_20210320_072206.jpg
>
> Next I think a destructive torque test and then maybe some actual
> cutting... I need to finish the face plate
36 hours - For this purpose I think we are good.
http://electronicsam.com/images/greenmachine/IMG_20210320_072206.jpg
Next I think a destructive torque test and then maybe some actual
cutting... I need to finish the face plate first though.
On Fri, Mar 19, 2021 at 11:16 PM Chris Albertson
If you wanted a more durable part, you can send the STL file out to a
service that prints it in stainless steel. You might change the design to
reduce the bulk because they charge by the gram for the steel.
SpaceX is printing pre-burner parts for their new Raptor engines. If
anything needs to
3D printing fixtures to hold things you've 3D printed can be done the same way.
Put two cubes side by side with a bit of gap between. Position the object at
the divide so that it's half embedded in each cube, with no undercuts. Subtract
the object from both cubes. Print the cubes and you have
On Friday 19 March 2021 15:21:05 Sam Sokolik wrote:
> still running 18+ hours.
Sounds better Sam.
> On Fri, Mar 19, 2021 at 2:03 PM Gene Heskett
wrote:
> > On Friday 19 March 2021 13:07:58 Sam Sokolik wrote:
> > > I think you want it as hard as you can that still last a decent
> > > amount of
still running 18+ hours.
On Fri, Mar 19, 2021 at 2:03 PM Gene Heskett wrote:
> On Friday 19 March 2021 13:07:58 Sam Sokolik wrote:
>
> > I think you want it as hard as you can that still last a decent amount
> > of time.. Too rubbery and there will be more toque flex...
> >
> Yes, it folds up
On Friday 19 March 2021 13:07:58 Sam Sokolik wrote:
> I think you want it as hard as you can that still last a decent amount
> of time.. Too rubbery and there will be more toque flex...
>
Yes, it folds up and a nema 17 then makes sausage out of it.
[...]
Cheers, Gene Heskett
--
"There are
On Friday 19 March 2021 12:53:40 John Dammeyer wrote:
> There are some other printable filaments that are far more flexible.
> More like rubber. Would perhaps that material work better?
>
I tried TPU in a previous failure but it was too soft, PETG outlasted it
by 20/1. It also has a high
On Friday 19 March 2021 12:51:55 Chris Albertson wrote:
> When I first saw this, my idea was to print the internal tooth gear
> "backward" as a mold that makes up the central space in the aluminum
> housing, then pour in an epoxy/glass composite paste.
>
> I've seen this done on other projects,
On Friday 19 March 2021 11:03:05 Sam Sokolik wrote:
> So - this didn't make it 6 hours with the steppers running 833rpm
> (3000deg/min at the face plate) (forward reverse some positioning...)
>
> http://electronicsam.com/images/greenmachine/IMG_20210317_073558.jpg
>
> Now - I am sure it would
d perhaps that material work better?
>
> John
>
> > -Original Message-
> > From: Sam Sokolik [mailto:samco...@gmail.com]
> > Sent: March-19-21 8:03 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Maybe a minimally printed harmonic
> From: andy pugh [mailto:bodge...@gmail.com]
> On Fri, 19 Mar 2021 at 15:07, Sam Sokolik wrote:
> >
> > It isn't going to
> > be run like this in normal situations and you can always print more gears...
>
> I wouldn't imagine that printing a new flex gear talkies very long, either?
>
> --
>
Exactly...
On Fri, Mar 19, 2021, 11:58 AM andy pugh wrote:
> On Fri, 19 Mar 2021 at 15:07, Sam Sokolik wrote:
> >
> > It isn't going to
> > be run like this in normal situations and you can always print more
> gears...
>
> I wouldn't imagine that printing a new flex gear talkies very long,
On Fri, 19 Mar 2021 at 15:07, Sam Sokolik wrote:
>
> It isn't going to
> be run like this in normal situations and you can always print more gears...
I wouldn't imagine that printing a new flex gear talkies very long, either?
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and
gt; Subject: Re: [Emc-users] Maybe a minimally printed harmonic drive?
>
> So - this didn't make it 6 hours with the steppers running 833rpm
> (3000deg/min at the face plate) (forward reverse some positioning...)
>
> http://electronicsam.com/images/greenmachine/IMG_20210317_0
When I first saw this, my idea was to print the internal tooth gear
"backward" as a mold that makes up the central space in the aluminum
housing, then pour in an epoxy/glass composite paste.
I've seen this done on other projects, the most complex is a prosthetic
hand I'm slowly working on. The
So - this didn't make it 6 hours with the steppers running 833rpm
(3000deg/min at the face plate) (forward reverse some positioning...)
http://electronicsam.com/images/greenmachine/IMG_20210317_073558.jpg
Now - I am sure it would last longer if it was run slower... The flex gear
now has the
On Monday 15 March 2021 00:08:00 Sam Sokolik wrote:
> another painful video
>
> https://www.youtube.com/watch?v=U3e83H2mEyk
I would like to see it go clear around and back to zero. That lack of
backlash is, IMO, very very impressive.
You got me going on one with a 30/1 ratio, about done with
> From: Sam Sokolik [mailto:samco...@gmail.com]
>
> another painful video
>
> https://www.youtube.com/watch?v=U3e83H2mEyk
>
> On Sat, Mar 13, 2021 at 8:40 PM Sam Sokolik wrote:
>
> > Getting closer... I have to drill a bunch of holes in the face plate...
> > also have to preload the wheel
another painful video
https://www.youtube.com/watch?v=U3e83H2mEyk
On Sat, Mar 13, 2021 at 8:40 PM Sam Sokolik wrote:
> Getting closer... I have to drill a bunch of holes in the face plate...
> also have to preload the wheel bearing (grind a bit from the center)
>
>
Getting closer... I have to drill a bunch of holes in the face plate...
also have to preload the wheel bearing (grind a bit from the center)
http://electronicsam.com/images/greenmachine/IMG_20210313_201227.jpg
On Fri, Mar 12, 2021 at 10:41 AM Gene Heskett wrote:
> On Wednesday 10 March 2021
On Wednesday 10 March 2021 12:58:08 John Dammeyer wrote:
> Hi Sam,
> I found by making the wall thickness bigger along with the hole
> smaller and hub larger I was able to mount the hub on the lathe and
> bore both the bore and the outer part of the hub on the lathe to make
> them symmetrical.
On Wednesday 10 March 2021 12:58:08 John Dammeyer wrote:
> Hi Sam,
> I found by making the wall thickness bigger along with the hole
> smaller and hub larger I was able to mount the hub on the lathe and
> bore both the bore and the outer part of the hub on the lathe to make
> them symmetrical.
If this thing works decent enough - I could easily then 'shape' the outside
gears. pretty easy...
sam
On Wed, Mar 10, 2021 at 2:00 PM Chris Albertson
wrote:
> I've done this a few times. PVA is best used if the mold is new. You can
> spray in on the mold using an old spray bottle that used
I've done this a few times. PVA is best used if the mold is new. You can
spray in on the mold using an old spray bottle that used to hold kitchen
and bath spray cleaner that is well rinsed out. But after the mold is used
a few times mould release wax alone is OK.The PVA has some tiny film
What material did you print this in?
On 3/10/21 12:38 PM, Sam Sokolik wrote:
Yes. The rings can be swapped to change the output direction... (It can
be made so the stepper turns the same direction as the output shaft..). I
don't know if the friction would be reduced one way or the other...
Yes. The rings can be swapped to change the output direction... (It can
be made so the stepper turns the same direction as the output shaft..). I
don't know if the friction would be reduced one way or the other...
On Wed, Mar 10, 2021, 12:28 PM Gene Heskett wrote:
> On Wednesday 10 March 2021
On Wednesday 10 March 2021 12:54:09 Gene Heskett wrote:
> On Wednesday 10 March 2021 10:55:41 Sam Sokolik wrote:
> > another update - at 1/2 step - the discrete resolution should be
> > about 40,000 divisions per rotation. .009 deg.
> >
> > https://www.youtube.com/watch?v=IdfKre6zpEY
>
> Pretty
On Wednesday 10 March 2021 10:55:41 Sam Sokolik wrote:
> another update - at 1/2 step - the discrete resolution should be about
> 40,000 divisions per rotation. .009 deg.
>
> https://www.youtube.com/watch?v=IdfKre6zpEY
>
Pretty darned good Sam, definitely worth pursuing. With 2 bearings
This is the best and most durable DIY drive I've seen. One
improvement for the future is to make the internal tooth gears from
something other than 3D printed plastic. Perhaps you can cast them in
epoxy and fiber composite. If you used a timing belt as part of the mold
the cast teeth would be
another update - at 1/2 step - the discrete resolution should be about
40,000 divisions per rotation. .009 deg.
https://www.youtube.com/watch?v=IdfKre6zpEY
On Thu, Feb 4, 2021 at 4:00 PM Sam Sokolik wrote:
> https://www.youtube.com/watch?v=ZVVffljc7kE
>
> On Tue, Feb 2, 2021 at 9:46 AM Gene
https://www.youtube.com/watch?v=ZVVffljc7kE
On Tue, Feb 2, 2021 at 9:46 AM Gene Heskett wrote:
> On Tuesday 02 February 2021 08:30:56 Sam Sokolik wrote:
>
> > I have looked at cycloidal drives and feel that they have too many
> > parts :)
> >
> > Gene
> >
On Tuesday 02 February 2021 08:30:56 Sam Sokolik wrote:
> I have looked at cycloidal drives and feel that they have too many
> parts :)
>
> Gene
> https://www.youtube.com/watch?v=Gx263nnTrqY
>
> Ran for over 6 hours like that - about 850rpm input.
>
I am highly impressed.
Now finish the housing,
I have looked at cycloidal drives and feel that they have too many parts :)
Gene
https://www.youtube.com/watch?v=Gx263nnTrqY
Ran for over 6 hours like that - about 850rpm input.
On Thu, Jan 28, 2021 at 3:13 AM andrew beck
wrote:
> Guys just to chime in here.
>
> Sam went don't you design a
Guys just to chime in here.
Sam went don't you design a cycloidal drive instead. They are easy to make
on a normal 3 axis Cnc mill with a end mill and much more rigid than a
harmonic drive. As they are not so fragile. I'm planning on making some
on my VMC soon.I don't understand why use a
On 1/27/21 10:55 AM, Sam Sokolik wrote:
Nice being able to make things while I sleep..
2 outside side rings - one 202 teeth - one 200 teeth.
Inside flex ring - 200 teeth. Feels good - for what it is..
http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
A dual bearing block on both sides. Mount the 200 tooth ring to one block and
the 200+ tooth ring to the shaft on the other for the output. Mount the bar
with rollers to the other shaft and there's your drive. Put a little flange in
both rings to keep the flex ring centered. Lube it all very
How about a semi-rigid urethane adhesive bonding the flex ring to a rigid metal
hub? Have some interlocking features on the inside of the ring and edge of the
hub to keep it from shearing apart. Smooth-On makes a primer called UreBond II
that makes their urethane resins and rubbers stick to
https://youtu.be/nhHDrK6sCRs
On Wed, Jan 27, 2021 at 3:56 PM Gene Heskett wrote:
> On Wednesday 27 January 2021 16:04:45 Chris Albertson wrote:
>
> > This is a machine-tool related list. Many of us have 3D printers
> > too. So if you have both additive and subtractive tools available and
> >
On Wednesday 27 January 2021 16:04:45 Chris Albertson wrote:
> This is a machine-tool related list. Many of us have 3D printers
> too. So if you have both additive and subtractive tools available and
> want to make a harmonic drive may be the best option is to make a
> hybrid design with some
On Wed, 27 Jan 2021 at 21:07, Chris Albertson wrote:
> So I ask, Would it be possible to design an easy to make flex gear? I
> think so.
I am not so sure. In fact I am so not-sure that I am building an EDM
grinder to make hardened (or carbide) tooling with the right profile.
--
atp
"A
On Wednesday 27 January 2021 15:35:00 Gregg Eshelman via Emc-users wrote:
> Instead of a one piece flex cup, how about making a flex ring that
> connects to a rigid base with teeth or pins - something that
> interlocks but allows radial movement of the flex ring with respect to
> the base? No
This is a machine-tool related list. Many of us have 3D printers too.
So if you have both additive and subtractive tools available and want to
make a harmonic drive may be the best option is to make a hybrid design
with some parts of the drive made with different techniques.
Metal really is
Instead of a one piece flex cup, how about making a flex ring that connects to
a rigid base with teeth or pins - something that interlocks but allows radial
movement of the flex ring with respect to the base? No constant bending back
and forth to break the print layers apart.
On
For tests I tend to do things like clamp it to a drill press table and
power it with the chuck., Or even use a hand-held drill motor to very if
gears mesh. What I've found is plastic gears need to be about 3X larger
than metal ones.
On Wed, Jan 27, 2021 at 11:06 AM Sam Sokolik wrote:
> well -
well - that is the plan... but I need to create a decent housing to mount
it all... :) SMOM (simple matter of machining)
On Wed, Jan 27, 2021 at 12:59 PM Chris Albertson
wrote:
> Now, if you will, place it on a motor and run it for 24 hours and let us
> know what happens.
>
> On Wed, Jan 27,
Now, if you will, place it on a motor and run it for 24 hours and let us
know what happens.
On Wed, Jan 27, 2021 at 8:59 AM Sam Sokolik wrote:
> Nice being able to make things while I sleep..
>
> 2 outside side rings - one 202 teeth - one 200 teeth.
> Inside flex ring - 200 teeth. Feels good -
Nice being able to make things while I sleep..
2 outside side rings - one 202 teeth - one 200 teeth.
Inside flex ring - 200 teeth. Feels good - for what it is..
http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
I will give it a try - printing a 200 tooth and a taller 200 tooth flex
gear.
http://electronicsam.com/images/greenmachine/IMG_20210126_22.jpg
On Tue, Jan 26, 2021 at 8:07 PM Chris Albertson
wrote:
> I could read it well enough to see that they only quote prices. The
> old saying is
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