On Thu, 18 Apr 2019 at 01:22, Gene Heskett wrote:
> On Wednesday 17 April 2019 15:06:02 Chris Albertson wrote:
>
> [...]
> >
> > But if maybe you lock the spindle and turn the nut.
>
> This is the case, except you are turnbing the nut by using the xy
> steppers to drive the carousel which is turn
Hi Roland
On Thu, Apr 18, 2019, 3:23 PM Roland Jollivet
wrote:
> On Thu, 18 Apr 2019 at 01:22, Gene Heskett wrote:
>
> > On Wednesday 17 April 2019 15:06:02 Chris Albertson wrote:
> >
> > [...]
> > >
> > > But if maybe you lock the spindle and turn the nut.
> >
> > This is the case, except you
On Thu, 18 Apr 2019 at 10:22, Roland Jollivet wrote:
> To recap; small steppers 'drive' the carousel around to tighten the motor.
No, the motor drives round the carousel to tighten the collet.
It is really rather clever. Assuming that it can't work based purely
on guess-work seems silly.
I sug
On Thursday 18 April 2019 04:20:37 Roland Jollivet wrote:
> On Thu, 18 Apr 2019 at 01:22, Gene Heskett
wrote:
> > On Wednesday 17 April 2019 15:06:02 Chris Albertson wrote:
> >
> > [...]
> >
> > > But if maybe you lock the spindle and turn the nut.
> >
> > This is the case, except you are turnbi
Sorry, guys, I really do understand how it works. I thought I was quite
clear..
That's why I said the l steppers 'drive' the carousel around. Notice the '
'. Yes, to spell it out the motion of the X-Y steppers in a circular
motion results in the carousel rotating. The carousel rotates as a res
> On 18 Apr 2019, at 14:04, Roland Jollivet wrote:
>
> - disable the stepper drives so the gantry becomes passive and is pulled
> around instead
That’s even worse than the risk of losing steps by driving the carousel with
the axes.
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Driving the carousel is an even worse idea. Then the diameter of the carousel
becomes mechanical disadvantage and the subsequent moving of the undriven x and
y axis is guaranteed loss of position.
Using the XY axis is probably the best option, for this kind of idea. But I can
think of several
Disabling the X- Y drives sounds fine to me. Let the gantry get taken for
the ride. (assuming it's easily moved by hand with drives disabled)
Once the nut is tight, reverse the carousel motor for a moment to undo the
load.
Then enable drives and do a Z up, then home the machine.
With a setup lik
Hi,
We are looking for a date for the next linuxcnc meeting in Stuttgart, Germany.
All info here:
https://doodle.com/poll/7aeg98zwbi6qrtvx
Rene
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Disabling the X- Y drives sounds fine to me. Let the gantry get taken for
the ride. (assuming it's easily moved by hand with drives disabled)
Once the nut is tight, reverse the carousel motor for a moment to undo the
load.
Then enable drives and do a Z up, then home the machine.
With a setup lik
On Thursday 18 April 2019 05:30:13 TJoseph Powderly wrote:
> Hi Roland
>
> On Thu, Apr 18, 2019, 3:23 PM Roland Jollivet
>
>
> wrote:
> > On Thu, 18 Apr 2019 at 01:22, Gene Heskett
wrote:
> > > On Wednesday 17 April 2019 15:06:02 Chris Albertson wrote:
> > >
> > > [...]
> > >
> > > > But if may
On Thursday 18 April 2019 07:47:51 andy pugh wrote:
> On Thu, 18 Apr 2019 at 10:22, Roland Jollivet
wrote:
> > To recap; small steppers 'drive' the carousel around to tighten the
> > motor.
>
> No, the motor drives round the carousel to tighten the collet.
>
> It is really rather clever. Assumin
Google is your friend!
ft-lb =Nm * 0.73756
So 75Nm = 55.3 ft lbs
> -Original Message-
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: Thursday, April 18, 2019 11:45 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Something to think about re the hack-a-day too
Gene,
One N/m is .737 ft/lb
One hp is approx .745 watts
just think of the hp to watts conversion to mentally calculate the n/m to
ft/lb conversion - you will be close enough for almost any situation
in fact - using .75 for both conversions would work just fine
Stuart
On Thu, Apr 18, 2019 at
On Thursday 18 April 2019 11:50:00 Ken Strauss wrote:
> Google is your friend!
> ft-lb =Nm * 0.73756
> So 75Nm = 55.3 ft lbs
>
55 ft/lbs? Here the tool will walk out and break, very quickly at that
tension. Doubtfull I have used less than 75 ft-pounds on the TTS
adapters I use fairly universall
Forwarded Message
Subject: Re: [Emc-users] Something to think about re the hack-a-day
tool changer
Date: Thu, 18 Apr 2019 23:22:19 +0700
From: TJoseph Powderly
To: Gene Heskett
Hi Gene
On 04/18/2019 10:57 PM, Gene Heskett wrote:
On Thursday 18 April 2019 11:
> > Ditto if using an R8 directly, the R8 gets tightened with a 20 volt
> > electric impact wrench driving an 8 point 10mm socket a lot tighter
> > than I can draw it by hand with the supplied toy 10mm endwrench. If
> > not, the TTS in the R8 may slip and walk out. The life of that
> > socket bef
Hi All
The current discussion on making an ATC for ER collet style spindles has
given me an idea.
As Gene aptly says, R8 and ER collets weren't designed with ATC's in mind.
In the application of routing, engraving and other light duty machining,
the assembly of ER collet, nut and tool could be r
On Thursday 18 April 2019 15:29:35 Roland Jollivet wrote:
> > > Ditto if using an R8 directly, the R8 gets tightened with a 20
> > > volt
> > >
> > > electric impact wrench driving an 8 point 10mm socket a lot
> > > tighter than I can draw it by hand with the supplied toy 10mm
> > > endwrench.
On Thursday 18 April 2019 16:44:40 Roland Jollivet wrote:
> Hi All
>
> The current discussion on making an ATC for ER collet style spindles
> has given me an idea.
> As Gene aptly says, R8 and ER collets weren't designed with ATC's in
> mind.
>
> In the application of routing, engraving and other
Perhaps these would work for engraving since runout would be somewhat
non-critical. However, with small milling cutters you want TIR of 0.0002 or
so and there is no obvious way that the threads would achieve that level of
concentricity. I find that it is hard to get low TIR even using precision ER
> On 18 Apr 2019, at 23:29, Gene Heskett wrote:
>
> Cutting duties with 6mm end mills would still need a collets death grip I
> think. YMMV of course.
He did mention Weldon Shank.
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> On 19 Apr 2019, at 00:47, Ken Strauss wrote:
>
> there is no obvious way that the threads would achieve that level of
> concentricity.
You can still register on the taper.
Solid “collets” and off-the-shelf nuts seem so obvious that I am puzzled that I
have never found them. It solves the
On Thursday 18 April 2019 19:49:10 Andy Pugh wrote:
> > On 18 Apr 2019, at 23:29, Gene Heskett wrote:
> >
> > Cutting duties with 6mm end mills would still need a collets death
> > grip I think. YMMV of course.
>
> He did mention Weldon Shank.
>
>
Ok, since I'm a new bee in terms of a weldon, wha
Weldon shank is round with a flat on the side. A setscrew prevents pullout.
I haven't done personal measurements but I've often read that Weldon shank
is worse than ER collets for low TIR when using small diameter tools which
are usual in a high speed spindle.
> -Original Message-
> From:
The Weldon style has a set screw flat that's angled toward the cutting end.
Tighten the set screw on it and the tool is forced upwards until the deeper end
of the flat contacts the side of the set screw. That makes the too resistant to
shifting axially, preventing loosening or shifting of tool l
about weldon shank
https://tinyurl.com/yyxlreku
On 04/19/2019 06:52 AM, Andy Pugh wrote:
On 19 Apr 2019, at 00:47, Ken Strauss wrote:
there is no obvious way that the threads would achieve that level of
concentricity.
You can still register on the taper. Solid “collets” and off-the-shelf
nut
Greg thanks
On 04/19/2019 08:36 AM, Gregg Eshelman via Emc-users wrote:
The Weldon style has a set screw flat that's angled toward the cutting
end.
Tighten the set screw on it and the tool is forced upwards until the
deeper end of the flat contacts the side of the set screw.
That makes
I have used some reasonable quality holders for Weldon shank tools -- Bison
R8 holders and Tormach TTS -- and none had angled setscrews. In all cases
the setscrew was very closely perpendicular to the axis of the tool.
> -Original Message-
> From: TJoseph Powderly [mailto:tjt...@gmail.com]
>
>
> Solid “collets” and off-the-shelf nuts seem so obvious that I am puzzled
> that I have never found them. It solves the tool length puzzle at a stroke.
>
>
>
Assuming you mean having a dedicated collet and nut per cutting bit;
You could just loctite the bit in the collet. Keep it tightened in
Hi Gene
I don't know how you're engaging the spanner on the spindle shaft for your
ATC, but you could use one of these;
https://www.ebay.com/itm/Durable-Car-Locking-System-2-Wire-Central-Door-Lock-Solenoid-Actuator-Motor-12V/131945015051?epid=511506243&hash=item1eb889270b:g:Ly0AAOSw4shX4NhW
Easi
On Thursday 18 April 2019 20:02:45 Ken Strauss wrote:
> Weldon shank is round with a flat on the side. A setscrew prevents
> pullout.
>
> I haven't done personal measurements but I've often read that Weldon
> shank is worse than ER collets for low TIR when using small diameter
> tools which are us
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