Have you heard of openDog, the open source hardware robot quadruped? A google
for open source robot dog brings up it and some others people are working on.
Boston Dynamics has been a big inspiration.
Now when do we get open source bipedal robots?
On Thursday, March 11, 2021, 12:58:00 PM MST
> Harmonic and cycloidic reduction drives are to slow
> 6:1 or 10:1 should work.
My first robot arm used 9:1 3d printed cycloidal gear boxed (plus 3:1 motor
to gearbox pulley reduction). Cyclodial ratios can be made small with less
teeth/lobes and larger pins. I'm not sure if that makes them an
Rotary broaching is a process used to quickly cut internal ring gears.
On Thursday, March 11, 2021, 6:21:08 AM MST, andy pugh
wrote:
On Thu, 11 Mar 2021 at 13:05, wrote:
> I believe that wire EDM is the usual way to make small quantities of internal
> (ring) gears. It seems possibl
On Thu, 11 Mar 2021 at 19:58, Chris Albertson wrote:
> Using robotic
> terminology it will be a quadruped where each leg has 3 degrees of freedom.
> My goal is to design something that can be made for under $100 per axis
> ($1,200 total cost) This is actually possible but performance is poor
Emc-users
Sent: March 11, 2021 1:39 PM
To: Enhanced Machine Controller (EMC)
Cc: Gregg Eshelman
Subject: Re: [Emc-users] Gear cutting setup on low-cost HF mill??
Could have it water jet cut on a machine with a tilting head for kerf angle
compensation. Water jet cutters tend to make the exit
> Not sure if anyone mentioned, spiral hobs will not work unless your hob can
> be tilted to the required angle of the hob cutter. Even for straight teeth,
> it's at least 1.5�.
Wouldn't it be easier in the home workshop to just tilt the rotary table
holding the work piece up 1.5 degrees?
___
THanks, all for you advice. I think the best way to get a small ring gear
is to buy one.
What I'm doing is a design-study to find out the best kind of reduction
system. Timing belts are very easy to use but sun/planet gears are far
more compact. I want to make a machine, using machine-tool t
On Thu, 11 Mar 2021 at 19:29, Jon Elson wrote:
> Bridgeport made an adapter to turn their mill into a mini
> shaper for this purpose.
A "slotting head"
Many mills had them available as an accessory. (Including my Harrison)
it basically makes them into a slotter, rather than a shaper:
http://ww
On 03/11/2021 12:39 PM, Peter Hodgson wrote:
Could you not make a broaching cutter mounted in the quill and cnc broach one
tooth at a time with the stock mounted on a rotary table?
That's a slow version of the custom gear cutter and right
angle drive.
Bridgeport made an adapter to turn their
Oohh that looks like fun!
Phil T.
The Feral Engineer
Check out my LinuxCNC tutorials, machine builds and other antics at
www.youtube.com/c/theferalengineer
On Thu, Mar 11, 2021, 2:18 PM andy pugh wrote:
> On Thu, 11 Mar 2021 at 19:11, Feral Engineer
> wrote:
> >
> > As a side note, fanuc, Mit
On Thu, 11 Mar 2021 at 19:11, Feral Engineer wrote:
>
> As a side note, fanuc, Mitsubishi and the other big names have a dedicated
> hobbing function that synchronizes the linear and rotary axis based on
> number of teeth, module, pitch diameter, tooth angle... Bunch of factors.
The LinuxCNC vers
As a side note, fanuc, Mitsubishi and the other big names have a dedicated
hobbing function that synchronizes the linear and rotary axis based on
number of teeth, module, pitch diameter, tooth angle... Bunch of factors.
I can upload documentation on these functions if anyone wants to read about
it
Not sure if anyone mentioned, spiral hobs will not work unless your hob can
be tilted to the required angle of the hob cutter. Even for straight teeth,
it's at least 1.5°. Usually, I do this with a dedicated live tool that has
an adjustable angle or a mill turn machine (DMG Mori NT/NTX series
machi
One method is to make a multi-tooth straight hob with teeth that have flat
sides. On each pass it does a full cut on the tooth or gullet on the center
line of the gear and partial cuts to the teeth and gullets above and below.
That makes a faceted approximation of involute teeth. If you have the
That’s basically Andy’s idea to simulate a fellows gear shaper by interpolating
the tooth form. It’s probably the easiest way if you can work out the math and
lock the quill rotation. And grind the appropriate size cutter.
Matt
> On Mar 11, 2021, at 1:39 PM, Peter Hodgson wrote:
>
> Could y
Could you not make a broaching cutter mounted in the quill and cnc broach one
tooth at a time with the stock mounted on a rotary table?
Pete
> On 11 Mar 2021, at 18:06, Greg Bernard wrote:
>
> This doesn't address the op but it is intriguing:
> https://www.igus.com/info/3d-printed-gear
>
>>
Could have it water jet cut on a machine with a tilting head for kerf angle
compensation. Water jet cutters tend to make the exit side of the cut slightly
wider so a 2 axis tilting head can push all that to the waste side.
On Thursday, March 11, 2021, 3:15:07 AM MST, andy pugh
wrote:
Cu
This doesn't address the op but it is intriguing:
https://www.igus.com/info/3d-printed-gear
On Thu, Mar 11, 2021, 11:14 AM andy pugh wrote:
> On Thu, 11 Mar 2021 at 17:08, Jon Elson wrote:
>
> > Or, with a mini right angle drive attached to the machine quill.
>
> Though to do that you would hav
On Thu, 11 Mar 2021 at 17:08, Jon Elson wrote:
> Or, with a mini right angle drive attached to the machine quill.
Though to do that you would have to make your own convex involute cutters.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of
On 03/11/2021 12:28 AM, Chris Albertson wrote:
The really hard part that I don't know how to do is a ring gear. I can't
figure out how to cut internal teeth. I might just buy these if they
can't be machined.
Internal teeth need to be cut with a gear shaper, or
specialized gear hobbing machi
On Thu, 11 Mar 2021 at 13:05, wrote:
> I believe that wire EDM is the usual way to make small quantities of internal
> (ring) gears. It seems possible that one might imitate a mini-Fellows by
> moving the z-axis up/down to shave the gear.
Bear in mind that the Fellows system still generates th
chine Controller (EMC)
Subject: Re: [Emc-users] Gear cutting setup on low-cost HF mill??
On Thu, 11 Mar 2021 at 06:31, Chris Albertson wrote:
> What's the best kind of steel to buy that gives a combination of
> machinability on a small mill and strength.
I will concur with Marcus, when maki
On Thu, 11 Mar 2021 at 06:31, Chris Albertson wrote:
> What's the best kind of steel to buy that gives a
> combination of machinability on a small mill and strength.
I will concur with Marcus, when making starter gears for the Ner-a-Car
I used EN8.
EN8 is the old name (ie, before 1970) name for
On 2021-03-11 06:28, Chris Albertson wrote:
What's the best kind of steel to buy that gives a
combination of machinability on a small mill and strength.
I would be inclined to try EN8T which is a machinable steel with some
tensile strength that can easily be hardened afterwards, using an
oxy-
Greg Michalski wrote:
>
> Another thought comes to mind, could wire EDM be used to cut very small
> gears and pinions?
You bet! For hair-thin wheels and intricate escapement
profiles, they are the way to go. Of course, wire EDM is a
whole other domain, and you can't buy a $500 Chinese wire EDM
Jon Elson wrote..
It just seems to me that if you have a CNC machine of any type,
you should be able to cut a master tool for the form required.
Then, that tool could cut the gear teeth directly, and reduce a
5 hour job to 15 minutes! Even if you only have a mill, you can
mount a di
On Fri, 2008-06-13 at 20:29 +0100, Dave Caroline wrote:
> Idea is ok but Dremel stuff is in no way suitable for the scales that
> Ian Wright or us need when cutting watch pinion sizes.
I just used the Dremel term to describe a type of abrasive disk, because
most people are familiar with Dremel too
On Fri, 2008-06-13 at 13:17 -0500, Jon Elson wrote:
> Ian W. Wright wrote:
>
> > One of the main reasons I want to try to generate gears and,
> > particularly, pinions is the great problem I have in trying to make
> > working pinion cutters small enough for the watches I work on.
> It just seems
Idea is ok but Dremel stuff is in no way suitable for the scales that
Ian Wright or us need when cutting watch pinion sizes. The positional
accuracy needed to get a good form to the result is also a problem.
Involute form is easy as a hobbing action and generation is possible
but not for cycloidal
Another thought comes to mind, could wire EDM be used to cut very small
gears and pinions?
I know I've seen someone take a rotary tool similar to a Proxon (beefy
dremel type) and true out the spindle and cut his collets using EDM and they
were fairly small. So I don't see why doing gears - as
On Fri, 2008-06-13 at 09:40 +0100, Ian W. Wright wrote:
... snip
> The big problem making a cutter is all down to the size and the
> difficulty in measuring and working to exact tiny dimensions. The 5-leaf
> pinion I need to make at the moment has a flat in the bottom of the
> tooth spaces of ju
Ian W. Wright wrote:
> One of the main reasons I want to try to generate gears and,
> particularly, pinions is the great problem I have in trying to make
> working pinion cutters small enough for the watches I work on.
It just seems to me that if you have a CNC machine of any type,
you should b
We should talk one day, I work with Chris Lowe at Richards of Burton,
and have made a cnc to cut gears here, I still use a Safag for the
really small stuff though. I want to do profile work for escape
wheels, verge and normal.
Dave Caroline
archivist on the #emc IRC channel on freenode
--
Hi Kirk,
One of the main reasons I want to try to generate gears and,
particularly, pinions is the great problem I have in trying to make
working pinion cutters small enough for the watches I work on. I could
get cutters made but, as you have said, a different one is required for
each individu
On Thu, 2008-06-12 at 03:45 -0400, W. Jacobs wrote:
> I do not know much about CNC operation but need to ask a question about
> the operation similar to this gear cutting.
>
> Machinery's handbook (20th) describes how to construct an involute on
> page 288. I read this as the involute is the le
On Thu, 2008-06-12 at 01:51 -0700, Kirk Wallace wrote:
> On Thu, 2008-06-12 at 08:31 +0100, Steve Blackmore wrote:
> ... snip
> >
> > http://www.jeffree.co.uk/Pages/cnc-wheel-cutting-engine.htm
> >
> > I've seen that in operation and used it at a show here in the UK, it's
> > not slow, gear cutte
Steve Blackmore wrote:
> On Thu, 12 Jun 2008 00:38:02 -0500, you wrote:
>>In theory, this can be done. A thin slitting saw would deflect
>>too much to get an accurate tooth profile. You can buy gear
>>tooth cutters and run them like this, and it will go much
>>faster, which is still fairly sl
On Thu, 2008-06-12 at 08:31 +0100, Steve Blackmore wrote:
... snip
>
> http://www.jeffree.co.uk/Pages/cnc-wheel-cutting-engine.htm
>
> I've seen that in operation and used it at a show here in the UK, it's
> not slow, gear cutter rpm was about 2500 rpm and you can stuff the
> cutter through the b
I do not know much about CNC operation but need to ask a question about
the operation similar to this gear cutting.
Machinery's handbook (20th) describes how to construct an involute on
page 288. I read this as the involute is the length of a line tangent
to the circle, equal to the cord of th
On Thu, 12 Jun 2008 00:38:02 -0500, you wrote:
>Kirk Wallace wrote:
>> Has anyone tried cutting gears with something similar to this
>> arrangement?
>>
>> http://www.wallacecompany.com/machine_shop/Gear_Cutter-1b.png
>>
>> I was thinking a slot saw (gray disk) could be used, centered on the
>>
Kirk Wallace wrote:
> Has anyone tried cutting gears with something similar to this
> arrangement?
>
> http://www.wallacecompany.com/machine_shop/Gear_Cutter-1b.png
>
> I was thinking a slot saw (gray disk) could be used, centered on the
> gear shaft(violet). The gear tooth form could be followe
Here is an interesting gear link:
http://www.cadquest.com/books/pdf/gears.pdf
--
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/
Hardinge HNC/EMC CNC lathe,
Bridgeport mill conversion, doing XY now,
Zubal lathe conversion pending
Craftsman AA 109 restoration
Shizuoka S
42 matches
Mail list logo
