Re: [Emc-users] bigger problem

[andy pugh]

> I have zero clue what has occurred, but the ini file for my G0704 seems
> to have reverted somehow to a mid July date.
>
> Maybe you just picked a different config?

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atp
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for the especial use of mechanical geniuses, daredevils and lunatics."
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Re: [Emc-users] NO_FORCE_HOMING is not working

[Gene Heskett]

On Wednesday 21 September 2016 16:21:01 Nicklas Karlsson wrote:

> > > and put in a NO_FORCE_HOMING like it says in the docs in
> > > the only two axis's a lathe normally,
> >
> > NO_FORCE_HOMING goes in [TRAJ]
>
> It is there I have it to and it works.

Thanks Nicklas.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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Re: [Emc-users] NO_FORCE_HOMING is not working

[Gene Heskett]

On Wednesday 21 September 2016 15:15:10 andy pugh wrote:

> On 21 September 2016 at 22:05, Gene Heskett  
wrote:
> > and put in a NO_FORCE_HOMING like it says in the docs in
> > the only two axis's a lathe normally,
>
> NO_FORCE_HOMING goes in [TRAJ]
>
> http://linuxcnc.org/docs/2.7/html/config/ini-config.html#_traj_section

Duh! Thanks Andy.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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[Emc-users] bigger problem

[Gene Heskett]

Greetings all;

I have zero clue what has occurred, but the ini file for my G0704 seems 
to have reverted somehow to a mid July date. IOW, it never got 
converted, except I know it did, and it ran just fine last week.  Now it 
shuts down at random points doing a 360 degree, z-0.300 p12, proclaiming 
I need to go fix my joints limits for axis 1 when its 2" from the limit 
in the ini file.

Not clue how it got reverted, but I obviously need a copy of Andy's joint 
conversion script so I can re-run it.

This machine, like all of them has been updated nightly for yonks.
 
Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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[Emc-users] NO_FORCE_HOMING is not working

[Gene Heskett]

Greetings all;

Not sure but ISTR seeing a 2.8-pre in the lcnc headbar.

But, while this BoB seems to have excellent timeing as I can see the step 
pulse have 10ns rise & fall times, I am unable to put the spindle 
circuit live for a where the heck is it on this card test.

I have put # in front of all the keywords that start with HOME in 
the .ini file, and put in a NO_FORCE_HOMING like it says in the docs in 
the only two axis's a lathe normally, but I still cannot run this 
short .ngc program. I think the home is being being killed/nullified by 
the need to hit escape to stop the forever load scan. With no machine to 
activate home switches, and no encoder either, the safety features get 
in the way of tracing signals.
%
( to find the spindle on this breakout interface)
( need to find 4 signals, pwm, enable, reverse, and an enable for the 
vfd)
s1000
o10 WHILE [1]
m3
g4 p.1
m4
g4 p.1
m5
g4 p.2
o10 endwhile
m2
%

Is that the problem?  Easily fixed I think, once I sat down and the back 
pain has eased enough to think. So I will try running 100,000 times 
while I poke around with a scope probe.  OTOH, an estop shutdown on TLM 
does not unhome it. Nor does an esc stop on any of the machines here.

Needless to say, the 5i25 doesn't even come close to using the same pins 
as a Mach install does. Finding z was easy, its on the pin set labeled 
for a B axis, and x is on the group for the Y axis. I did find the 
spindle's pwm signal but I'll be if I can find the spindle enables and 
brakes. Not sure why, but the B group is the only one whose led responds 
as an "I'm running" tally although I've see a few blinks on other pin 
groups as I was finding the mist and flood buttons. 

Anyway, clues welcomed.

Thanks all.



Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] xl pulleys

[Chris Albertson]

All the belt suppliers like Gates, have web sites with engineering data.
If you know your requirements (torque, power rpm) then yo add a safety
factor of about 2.5 then select the parts.  If you do this then with either
belt type you should be able to stall your motor.

This paper is like the bible of timing belts.  Easy to understand too it's
worth reading if you are using belts
http://file.lasersaur.com/docs-thirdparty/The_World_of_Timing_Belts.pdf

On Wed, Sep 21, 2016 at 6:22 AM, Gene Heskett  wrote:

> On Wednesday 21 September 2016 01:15:54 Chris Albertson wrote:
>
> > Actually drilling the timing belt is not a bad idea.   The older MXL
> > type belts used a trapezoid tooth belt but the new high torque "HTD"
> > Designs use circular profile teeth.They really are bater and
> > transmit more torque with less belt tension required.   Even newer
> > designs are GT2 and GT3 and they use circular test also.  It seems
> > counter intuitive at first that round teeth would hold more force.
> > But the load is more distributed the the tooth profile lack street
> > concentrators (corners)  Any new design should be using g the HTD or
> > newer profiles
> >
> Humm. All I have done with the small round teeth stuff has failed in
> relatively short times.  Even the OEM motor in its OEM mounting could
> make it hop teeth and burn up both the teeth on the belt and the black
> plastic pulley on the motor.
>
> However, after mounting my jackshaft in the same manner as the OEM motor
> was mounted, I now understand that it is not the most rigid mount, and
> does allow the motor, or my jackshaft, to flex enough that it finds the
> slack to start the destruction process.
>
> So now my jackshaft has an adjustable screw sticking out of an added boss
> on the load end of the shaft that is in solid contact with the bottom of
> the bed, and located directly in line with the reaction force of pulling
> a heavy cut.
>
> I also changed the "gear" ratios so as to get another 300 revs when the
> backgear is in low. That reduces the pull on the belt at the same time.
> I don't recall having the backgear in high unless cutting alu since.
> Top revs in high gear for TLM is about 1500, low gear around 750-800.
>
> > This is the tooth design I was thinking of when I said "ball end"
> > mill.
> >
> > While on the subject I found a neat program that will let you design
> > almost any kind of gear (yes ANY kind, even non-round ones) then then
> > it creates G-code to make it.
> > http://www.gear2motion.com
> > I've not used it myself and likely will not as it seem to run only in
> > MS Windows.
>
> I have to wonder if wine or crossover will run it. When I have some time
> (whats that) I might find out.
> >
> > On Tue, Sep 20, 2016 at 2:20 PM, Martin Dobbins 
> wrote:
> > > Gene wrote:
> > > >The ball end wouldn't be the tool for the job as the bottom of the
> > > > gullet
> > >
> > > has sharp corners except for the OEM belt of a 7x12. And there >are
> > > 2 common face angles in >use and I've not the memory to quote
> > > whether its 14.5 degrees or 20 degrees for the face angle per belt
> > > tooth style.
> > >
> > > >Bigger than xl is probaqbly 20 degrees but that leads to belt
> > > > hopping if
> > >
> > > not tighter than a drum so I'd assume its 14.5 on the xl as they
> > > will rip the teeth off the backing >before they'll hop a tooth,
> > > assuming the shaft centers can't flex.
> > >
> > > Absolutely no experience with timing pulleys here :-), and of course
> > > from that perspective it's always "how hard can it be?"
> > >
> > > No cnc abuse in this video just a lot of old British iron, but where
> > > do you get the tooth profiles from? "You can see the belt
> > > manufactures details or get the profile for the cutter by curving
> > > the belt to the required diameter.?" (from the comments below the
> > > video)
> > >
> > > https://www.youtube.com/watch?v=kCiujbcrQzc
> > >
> > > This fellow just drilled some holes, but since he glibly points out
> > > that in his case it was pure math to decide drill size and spacing,
> > > it *must* be OK.
> > >
> > > https://www.youtube.com/watch?v=vJaacHN-A0Y
> > >
> > > I posted this without a thought to the serious matter at hand, and
> > > just hope it brightens up your day.
> > >
> > > Martin
>
> Thanks Chris.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page 
>
> 
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Re: [Emc-users] snagged touch probe on eBay - anybody know how to interface ?

[Jon Elson]

On 09/20/2016 11:49 PM, hubert wrote:
> It will be a while before I will start getting results.  I need to pick
> up the Mill and then find a way to get it into my shop.  The shop is a
> converted bedroom with only a 36" door opening out on a backyard Patio.
> With luck we will get it wired in this weekend, with probeand parts
> should arriving Early Next week.
>
In my last house, there was a 32" (I think) standard door 
from the garage to the basement.  I managed to work a 
Bridgeport mill through that door with just a little 
thinking.  I ran the table to one end, angled it through the 
doorway, then cranked the table to the other extreme and 
swung it inside.

Jon

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Re: [Emc-users] xl pulleys

[Gene Heskett]

On Wednesday 21 September 2016 01:15:54 Chris Albertson wrote:

> Actually drilling the timing belt is not a bad idea.   The older MXL
> type belts used a trapezoid tooth belt but the new high torque "HTD"
> Designs use circular profile teeth.They really are bater and
> transmit more torque with less belt tension required.   Even newer
> designs are GT2 and GT3 and they use circular test also.  It seems
> counter intuitive at first that round teeth would hold more force. 
> But the load is more distributed the the tooth profile lack street
> concentrators (corners)  Any new design should be using g the HTD or
> newer profiles
>
Humm. All I have done with the small round teeth stuff has failed in 
relatively short times.  Even the OEM motor in its OEM mounting could 
make it hop teeth and burn up both the teeth on the belt and the black 
plastic pulley on the motor.

However, after mounting my jackshaft in the same manner as the OEM motor 
was mounted, I now understand that it is not the most rigid mount, and 
does allow the motor, or my jackshaft, to flex enough that it finds the 
slack to start the destruction process.

So now my jackshaft has an adjustable screw sticking out of an added boss 
on the load end of the shaft that is in solid contact with the bottom of 
the bed, and located directly in line with the reaction force of pulling 
a heavy cut.

I also changed the "gear" ratios so as to get another 300 revs when the 
backgear is in low. That reduces the pull on the belt at the same time. 
I don't recall having the backgear in high unless cutting alu since.  
Top revs in high gear for TLM is about 1500, low gear around 750-800.

> This is the tooth design I was thinking of when I said "ball end"
> mill.
>
> While on the subject I found a neat program that will let you design
> almost any kind of gear (yes ANY kind, even non-round ones) then then
> it creates G-code to make it.
> http://www.gear2motion.com
> I've not used it myself and likely will not as it seem to run only in
> MS Windows.

I have to wonder if wine or crossover will run it. When I have some time 
(whats that) I might find out.
>
> On Tue, Sep 20, 2016 at 2:20 PM, Martin Dobbins  
wrote:
> > Gene wrote:
> > >The ball end wouldn't be the tool for the job as the bottom of the
> > > gullet
> >
> > has sharp corners except for the OEM belt of a 7x12. And there >are
> > 2 common face angles in >use and I've not the memory to quote
> > whether its 14.5 degrees or 20 degrees for the face angle per belt
> > tooth style.
> >
> > >Bigger than xl is probaqbly 20 degrees but that leads to belt
> > > hopping if
> >
> > not tighter than a drum so I'd assume its 14.5 on the xl as they
> > will rip the teeth off the backing >before they'll hop a tooth,
> > assuming the shaft centers can't flex.
> >
> > Absolutely no experience with timing pulleys here :-), and of course
> > from that perspective it's always "how hard can it be?"
> >
> > No cnc abuse in this video just a lot of old British iron, but where
> > do you get the tooth profiles from? "You can see the belt
> > manufactures details or get the profile for the cutter by curving
> > the belt to the required diameter.?" (from the comments below the
> > video)
> >
> > https://www.youtube.com/watch?v=kCiujbcrQzc
> >
> > This fellow just drilled some holes, but since he glibly points out
> > that in his case it was pure math to decide drill size and spacing,
> > it *must* be OK.
> >
> > https://www.youtube.com/watch?v=vJaacHN-A0Y
> >
> > I posted this without a thought to the serious matter at hand, and
> > just hope it brightens up your day.
> >
> > Martin

Thanks Chris.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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