bject: Re: [Emc-users] Cheaper than normal FHA-25B
>
> I saw the fusion360 option.
>
> And I know solidworks can do that too.
>
> I would definitely want to mathematically calculate it. Seems a waste to
> introduce error on the first step lol. Especially if I don't have to.
&
I saw the fusion360 option.
And I know solidworks can do that too.
I would definitely want to mathematically calculate it. Seems a waste to
introduce error on the first step lol. Especially if I don't have to.
Might be a good idea to 3d print the first one and then make a big proper
one from
Pretty sure I read an article about harmonic drives and cycloidal drive from
local university.
> There are two good tutorials on designing the gears. Both depend more on
> geometric construction than math. They first generate some points then
> fit a spine. I've read this is not-exact but
There are two good tutorials on designing the gears. Both depend more on
geometric construction than math. They first generate some points then
fit a spine. I've read this is not-exact but the error can be as small as
you like. Just make more points and the spline gets better.
Going into the
Look for drawn cup needle roller bearings. They're made in a wide range of
sizes.
On Saturday, May 16, 2020, 8:53:39 PM MDT, andrew beck
wrote:
Chris
So do they use some needle roller bearings that run on the lobes or
something?
I could make that work I reckon. I already have the
Hey Chris.
That's awesome. I was just looking at that video lol.
Do you know how he is designing these. I know that the lobes are
calculated by a equation.
It would be good to see the equations that go into this and any plug-ins he
uses etc.
I'm quite keen to build one of these. Like you
Paul Gould is doing good work with these reduction drives. This video
shows how a triple reduction system works and just how simple it is.
Note that all the points of contact with the plastic lobes are ball bearing
units.This unit is about as complex as they get and it is still easy to
see
Chris
So do they use some needle roller bearings that run on the lobes or
something?
I could make that work I reckon. I already have the massive big angular
contact bearings and if I can make the lobe part OK then I'm away.
Add a big clamp to hold everything rigid and tight for milling and I
Actually the 3D printed plastic cycloidal lobes are lasting quite a
while. The reason it can work is that rather then the round pins
shown on the demo video, real systems use tiny sealed ball bearing
units. So there is no sliding contact on the lobes.
On Sat, May 16, 2020 at 4:40 PM andrew beck
e Controller (EMC)
> Subject: Re: [Emc-users] Cheaper than normal FHA-25B
>
> THere are two different kinds of drives. The "harmonic" and
> "cycloidal". THey both use an eccentric center gear but the teeth
> have different shape. The cyclodal type use ar
The concern I have is that the cycloidal lobes will be unHardened and will
wear out faster.
They really need to be Hardened.
And If I made one it would have a decent size air or hydraulic clamp to
hold everything rigid for 4th axis positional work.
On Sun, May 17, 2020, 10:23 AM Chris Albertson
THere are two different kinds of drives. The "harmonic" and
"cycloidal". THey both use an eccentric center gear but the teeth
have different shape. The cyclodal type use arcs and have fewer
teeth. This is why I said they could be made using average equipment
-- just an end-mill.
You can get
On Saturday 16 May 2020 17:13:23 Chris Albertson wrote:
> On Sat, May 16, 2020 at 12:24 PM Gene Heskett
wrote:
> > Which then brings up the need for some math. So how would one go
> > about getting from a 3 phase stepper motors holding power, say 3 NM
> > to lbs/ft at the output of a 12/1
On Sat, May 16, 2020 at 12:24 PM Gene Heskett wrote:
>
> Which then brings up the need for some math. So how would one go about
> getting from a 3 phase stepper motors holding power, say 3 NM to lbs/ft
> at the output of a 12/1 cycloidal gear?
>
> Assuming zero losses in the bearings, which I'd
> -Original Message-
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: Saturday, May 16, 2020 4:32 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Cheaper than normal FHA-25B
>
> On Saturday 16 May 2020 16:01:08 Ken Strauss wrote:
>
>
@lists.sourceforge.net
> > Subject: Re: [Emc-users] Cheaper than normal FHA-25B
> >
> > On Saturday 16 May 2020 15:09:08 Chris Albertson wrote:
> > > One interesting and fun option is to make your own cycloidical
> > > reduction. These are completely buildable on
know the
reduction ratio for their unit.
See https://tormach.com/microarc-4-4th-axis-38412.html
> -Original Message-
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: Saturday, May 16, 2020 3:22 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Chea
On Saturday 16 May 2020 15:09:08 Chris Albertson wrote:
> One interesting and fun option is to make your own cycloidical
> reduction. These are completely buildable on a CNC mill that can do 2
> 1/2 D machining on mild steel. Unlike most other gears, these can be
> cut from plate stock with just
>
> > -Original Message-
> > From: Lester Caine [mailto:les...@lsces.uk]
> > Sent: May-16-20 1:23 AM
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] Cheaper than normal FHA-25B
> >
> > On 15/05/2020 13:08, andy pugh wrot
or fifth axis.
Thank you.
James Isaac.
From: David Berndt
Sent: May 16, 2020 2:18 AM
To: Enhanced Machine Controller (EMC) ; Roland
Jollivet
Subject: Re: [Emc-users] Cheaper than normal FHA-25B
Why are you particularly worried about that? Cyclodial gear boxes
be nasty.
And don't give up. They rely on you either being rude or just taking your
losses.
John
> -Original Message-
> From: Lester Caine [mailto:les...@lsces.uk]
> Sent: May-16-20 1:23 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Cheaper than
On Saturday 16 May 2020 12:48:22 Chris Albertson wrote:
> Some types of motor drives don't have backlash. Timing belts,
> cycloidal, and harmonic drives don't have enough backlash to worry
> about. The linked harmonic drive is as good as the leadscrew on the
> other axis.
>
But slack, any, in a
Some types of motor drives don't have backlash. Timing belts,
cycloidal, and harmonic drives don't have enough backlash to worry
about. The linked harmonic drive is as good as the leadscrew on the
other axis.
On Fri, May 15, 2020 at 10:53 PM Roland Jollivet
wrote:
>
> I've been thinking about
On Sat, 16 May 2020 at 08:08, David Berndt wrote:
> When reasonably sized harmonic drives with servo motors inbuilt are 250$
> on ebay, they are COTS. So the answer is yes. Just buy one of those and
> move on to solving a more interesting problem or making whatever the
> machine is supposed to
On 15/05/2020 13:08, andy pugh wrote:
I have no connection with the vendor, if you order one and receive
dolls-house furniture instead don't blame me.
As with many of these sellers it is questionable at times just what they
do actually have and where the product IS actually located. This one
Harmonic drive but they are expensive.
> I've been thinking about 4th axes;
> While motorised reduction drives are readily available, the issue is
> obviously backlash.
>
> One way to make a zero backlash drive is to use two identical
> gearbox/drives. Place them at opposite ends of the axis,
...@uberwin.com]
Sent: May-15-20 11:19 PM
To: Enhanced Machine Controller (EMC); Roland Jollivet
Subject: Re: [Emc-users] Cheaper than normal FHA-25B
Why are you particularly worried about that? Cyclodial gear boxes and
harmonic drives are both basically 0 backlash, with potentially some
lost
motion
[mailto:ber...@uberwin.com]
> > Sent: May-15-20 11:19 PM
> > To: Enhanced Machine Controller (EMC); Roland Jollivet
> > Subject: Re: [Emc-users] Cheaper than normal FHA-25B
> >
> > Why are you particularly worried about that? Cyclodial gear boxes and
> > h
Sent: May-15-20 11:19 PM
> To: Enhanced Machine Controller (EMC); Roland Jollivet
> Subject: Re: [Emc-users] Cheaper than normal FHA-25B
>
> Why are you particularly worried about that? Cyclodial gear boxes and
> harmonic drives are both basically 0 backlash, with potentially
Why are you particularly worried about that? Cyclodial gear boxes and
harmonic drives are both basically 0 backlash, with potentially some lost
motion. Most are repeatable well under 1 arc minute, which compared to a
lot of rotary tables already out there. And that's something like a .0017"
I've been thinking about 4th axes;
While motorised reduction drives are readily available, the issue is
obviously backlash.
One way to make a zero backlash drive is to use two identical
gearbox/drives. Place them at opposite ends of the axis, and pit them
against each other by a few encoder
before purchasing.
John Dammeyer
> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: May-15-20 5:09 AM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] Cheaper than normal FHA-25B
>
> The normally appear on eBay at up to 6
The normally appear on eBay at up to 6x this price.
https://www.ebay.co.uk/itm/233587431605
The B versions have conventional incremental encoders and hall
sensors, so are easy to integrate. Lots of torque, zero backlash and a
very strong and fancy big crossed-roller bearing make them an
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