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
I realize that water jet capability has improved over the years but is it
really up to accurately cutting a M0.5 internal gear?
I have made somewhat coarser ring gears by using a 0.03125 diameter endmill
and cutting as a 2.5D job in 5mm Delrin.
-Original Message-
From: Gregg Eshelman via E
> 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
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 to
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
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. At least some high volume small ring
gears are made of sintered metal. I don't know your application
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-
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