Re: [Emc-users] cutter offset misunderstanding

[Craig Hodne]

On 10/27/2015 08:31 PM, lloyd wilson wrote:
> (my misunderstanding, I'm sure)
>
> I'm investigating using the built-in cutter compensation, rather than 
> calculating absolute coordinates. The first program worked OK, but 
> LCNC complains about the following excerpt:
>
> 14: G41
> 15: G0X0.Y24.8610
> 16: G0Z-17.
> 17: M3
> 18: G1X7.5850Y21.5360Z-19.
> 19: G1X12.9820Z-19.
> 20: G1X24.4020Y11.5920Z-19.
> 21: G2X25.8100Y8.5000Z-19.I21.7100J8.5000
>
> (nn: numbers added in text editor)
>
> The complaint is 'straight feed in concave corner cannot be reached by 
> tool . near line 19'.
> With G41 active, the corner defined by lines 19 & 20 is convex - isn't 
> it?
>
> Would appreciate help untangling this conundrum
>
> thanks
>
> lloyd 

If G90.1 (absolute arc distance) is active, it should work as 
programmed. If G91.1 (incremental arc distance) is active, that would 
put the center of the arc at location X46.1120 Y 20.0920 and make a very 
large arc with a radius of 23.305. The line into the start of the arc 
(line 20) would be the inside of an acute intersection with the arc - a 
concave corner. And if that were the case, the ending point of the arc 
doesn't match the ending coordinates in line 21 - close, but not quite. 
If you substitute I-2.6920 J-3.0920 in line 21, does it then work?

Craig

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[Emc-users] Error in Documentation

[Todd Zuercher]

I've noticed a minor error in the documentation. 
http://linuxcnc.org/docs/html/hal/parallel_port.html#_pins 
I see that it says that the control pins (1,14,16,17) are outputs in all modes. 
That isn't really true, in x-mode they are inputs. 

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Todd Zuercher 
mailto:zuerc...@embarqmail.com 

 
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Re: [Emc-users] Ethernet Hostmot2 (drop packets at init)

[Jeff Epler]

On Mon, Oct 12, 2015 at 10:50:07AM +0200, Karlsson & Wang wrote:
> Yes it works great! Do you think this should be part of standard behaviour?

I talked to Seb about this change and we are uncomfortable putting it in
2.7 since it is an unnecessary change for Mesa boards.

However, I've prepared a branch
"(origin/)jepler/hm2-explicit-queue-write" which should be semantically
the same as the patch I offered earlier in this thread, which *you*
could merge to your own 2.7ish branch for your use and which I will
merge to our master branch if your testing produces a positive result.

I reworked it slightly because the first version created *two* ways to
gather up reads (explicit and implicit); the new version gets rid of the
old implicit way.  I did not test it on real hardware, I only
compile-tested it.

Jeff

The following changes since commit 71b31967e84d5e3306d447073d7a1843436ac1b3:

  LinuxCNC 2.7.1 release (2015-10-17 21:07:59 -0600)

are available in the git repository at:

  git://git.linuxcnc.org/git/linuxcnc.git jepler/hm2-explicit-queue-write

for you to fetch changes up to 66ca88f741a74a0e43f4bcf627c8dece96ef2d6d:

  hm2_eth: explicitly queue up writes from force_write (2015-10-27 20:27:05 
-0500)


Jeff Epler (2):
  hm2_eth: make write queueing explicit, not implicit
  hm2_eth: explicitly queue up writes from force_write

 src/hal/drivers/mesa-hostmot2/hm2_eth.c   | 2 +-
 src/hal/drivers/mesa-hostmot2/hostmot2-lowlevel.h | 2 ++
 src/hal/drivers/mesa-hostmot2/hostmot2.c  | 6 ++
 3 files changed, 9 insertions(+), 1 deletion(-)

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[Emc-users] cutter offset misunderstanding

[lloyd wilson]

(my misunderstanding, I'm sure)

I'm investigating using the built-in cutter compensation, rather than 
calculating absolute coordinates. The first program worked OK, but LCNC 
complains about the following excerpt:

14: G41
15: G0X0.Y24.8610
16: G0Z-17.
17: M3
18: G1X7.5850Y21.5360Z-19.
19: G1X12.9820Z-19.
20: G1X24.4020Y11.5920Z-19.
21: G2X25.8100Y8.5000Z-19.I21.7100J8.5000

(nn: numbers added in text editor)

The complaint is 'straight feed in concave corner cannot be reached by 
tool . near line 19'.
With G41 active, the corner defined by lines 19 & 20 is convex - isn't it?

Would appreciate help untangling this conundrum

thanks

lloyd

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Re: [Emc-users] Spiral spring covers

[andy pugh]

On 27 October 2015 at 18:44, Gene Heskett  wrote:
> I ran into that same problem Andy, and at one point considered to the
> point of tearing a cheap tape measure down to get its rewind spring, but
> could not figure out a way to rivet a piece of it so it would
> automaticly and evenly expand and contract.

It seems that some places are much more reasonably priced than others.

http://www.aliexpress.com/item/telescopic-spiral-spring-cover/32305550135.html?spm=2114.01020208.3.210.U3jqAs&ws_ab_test=searchweb201556_2_71_72_73_74_75,searchweb201527_2,searchweb201560_9

Looks a bit vague on sizes but presumably that $20 is for the smallest
size listed.

I imagine that they are made with a simple set of three rollers and an
angled entry guide.

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Re: [Emc-users] Spiral spring covers

[Gene Heskett]

On Tuesday 27 October 2015 11:17:18 andy pugh wrote:

> Does anyone know a cost-effective source of spiral spring covers?
>
> I have just been quoted £125 each for a pair of spiral spring
> leadscrew covers for my lathe (£318 delivered in VAT) by Beakbane. DQR
> didn't even bother to reply.
> Given that the ballscrew + double ballnut came in at £170 this seems
> somewhat excessive. Does anyone know where I can find some that I am
> prepared to afford?

I ran into that same problem Andy, and at one point considered to the 
point of tearing a cheap tape measure down to get its rewind spring, but 
could not figure out a way to rivet a piece of it so it would 
automaticly and evenly expand and contract.  Every way I came up with to 
fasten it, also restricted the ability to assume a suitably relaxed end 
to end tension.  That, combined with losing an inch on the right end 
travel, turned it into a "let the felts in ends of the nut" handle/wipe 
the debris from the screw.  Thats worked surprisingly well so far.

I can't say the same for my efforts to put felt seals on the rear of the 
X carriage, I keep running into the brass plate I extended forward from 
the motor mount to cover the rear of the x slider, and my motor folds it 
up like so much TP. So there is a sound of a bit of stuff in the x nut. 
But the motor has the power to mash it into the screw so its still 
working well enough.  That was an 8mm screw I got some of from one of 
our PMDX people, and the nuts, while flangeless, also did not have any 
felt wipers.  Hence I tried to seal the top of that gap at the rear. My 
x motor is on the rear of the carriage, which adds zero weight to the 
front V-way, demanding a tight gib strip.
 
I should someday, (when I find my missing round tuit) fabricate another 
nut holder with some old felt hat for wipers, like I did on the toy 
mill, but thats also a source of some give in the mill, requiring a huge 
preload tension to crush the felt, and the lathe is a lot more crowded 
than the toy mill is at its worst.  So the nut in the lathe was smashed 
into a cage, that is pulled  back closed over it by the cages mounting 
screws. The cage was made about a thou short of the nuts length & 
chamfered & stretched that much to get it trapped length ways.

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] Spiral spring covers

[PAUL LIEBENBERG]

Oh well, they can sit in the junk pile a bit longer!
- Original Message -
From: andy pugh 
To: Enhanced Machine Controller (EMC) 
Sent: Tue, 27 Oct 2015 11:16:24 -0600 (MDT)
Subject: Re: [Emc-users] Spiral spring covers

On 27 October 2015 at 17:05, PAUL LIEBENBERG  wrote:
> I went out to measure what I have - One is 50mm wide, and 2 more at 75mm 
wide. id of the coil is about 80mm i guess.
> They are new, but have sitting around and there is some light rust in a 
few spots.

I think the only one with ballscrews that fat is probably Sam

-- 
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Re: [Emc-users] Spiral spring covers

[andy pugh]

On 27 October 2015 at 17:05, PAUL LIEBENBERG  wrote:
> I went out to measure what I have - One is 50mm wide, and 2 more at 75mm 
> wide. id of the coil is about 80mm i guess.
> They are new, but have sitting around and there is some light rust in a few 
> spots.

I think the only one with ballscrews that fat is probably Sam

-- 
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http://www.ifixit.com/Manifesto

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Re: [Emc-users] Spiral spring covers

[andy pugh]

On 27 October 2015 at 16:26, PAUL LIEBENBERG  wrote:
> Hi Andy, I have some of those you can have, I will measure them up. I can 
> probably get them as far as the uk as my aunty is going home tomorrow.

Too late, I have already placed my order with DQR.

I am rather committed by other parts of the design to the 30-650-50 size too.

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http://www.ifixit.com/Manifesto

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Re: [Emc-users] Spiral spring covers

[PAUL LIEBENBERG]

I went out to measure what I have - One is 50mm wide, and 2 more at 75mm wide. 
id of the coil is about 80mm i guess. 
They are new, but have sitting around and there is some light rust in a few 
spots. 
Paul 

- Original Message -

From: "andy pugh"  
To: "Enhanced Machine Controller (EMC)"  
Sent: Tuesday, October 27, 2015 8:45:38 AM 
Subject: Re: [Emc-users] Spiral spring covers 

On 27 October 2015 at 15:35, Dave Caroline  wrote: 
> These are not much more than a version of a plain clock spring. I 
> imagine a bit of modification to a large clock spring 

I am rather committed to one that is 50mm wide, which would be quite a 
big clock spring. 

> or get a spring 
> from one of the pull out barriers used in public areas trade name was 
> tensator iirc 

I imagine that those are quite small, seat-belt sized at a guess. 

I rang DQR who import theirs from Germany, and the price came in as 
£41 each. Quite a difference. 

-- 
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If you can't fix it, you don't own it. 
http://www.ifixit.com/Manifesto 

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Re: [Emc-users] Spiral spring covers

[PAUL LIEBENBERG]

Hi Andy, I have some of those you can have, I will measure them up. I can 
probably get them as far as the uk as my aunty is going home tomorrow. 
Good Karma for answering all my questions! 
Paul 

- Original Message -

From: "andy pugh"  
To: "Enhanced Machine Controller (EMC)"  
Sent: Tuesday, October 27, 2015 8:17:18 AM 
Subject: [Emc-users] Spiral spring covers 

Does anyone know a cost-effective source of spiral spring covers? 

I have just been quoted £125 each for a pair of spiral spring 
leadscrew covers for my lathe (£318 delivered in VAT) by Beakbane. DQR 
didn't even bother to reply. 
Given that the ballscrew + double ballnut came in at £170 this seems 
somewhat excessive. Does anyone know where I can find some that I am 
prepared to afford? 

-- 
atp 
If you can't fix it, you don't own it. 
http://www.ifixit.com/Manifesto 

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Re: [Emc-users] Spiral spring covers

[Dave Caroline]

the tensator style are also used as constant force for tool balance
purposes and can be almost any size to suit.

Dave

On 27/10/2015, andy pugh  wrote:
> On 27 October 2015 at 15:35, Dave Caroline 
> wrote:
>> These are not much more than a version of a plain clock spring. I
>> imagine a bit of modification to a large clock spring
>
> I am rather committed to one that is 50mm wide, which would be quite a
> big clock spring.
>
>>  or get a spring
>> from one of the pull out barriers used in public areas trade name was
>> tensator iirc
>
> I imagine that those are quite small, seat-belt sized at a guess.
>
> I rang DQR who import theirs from Germany, and the price came in as
> £41 each. Quite a difference.
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
> --
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Re: [Emc-users] Spiral spring covers

[andy pugh]

On 27 October 2015 at 15:35, Dave Caroline  wrote:
> These are not much more than a version of a plain clock spring. I
> imagine a bit of modification to a large clock spring

I am rather committed to one that is 50mm wide, which would be quite a
big clock spring.

>  or get a spring
> from one of the pull out barriers used in public areas trade name was
> tensator iirc

I imagine that those are quite small, seat-belt sized at a guess.

I rang DQR who import theirs from Germany, and the price came in as
£41 each. Quite a difference.

-- 
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Re: [Emc-users] Spiral spring covers

[Dave Caroline]

These are not much more than a version of a plain clock spring. I
imagine a bit of modification to a large clock spring or get a spring
from one of the pull out barriers used in public areas trade name was
tensator iirc

Dave

On 27/10/2015, andy pugh  wrote:
> Does anyone know a cost-effective source of spiral spring covers?
>
> I have just been quoted £125 each for a pair of spiral spring
> leadscrew covers for my lathe (£318 delivered in VAT) by Beakbane. DQR
> didn't even bother to reply.
> Given that the ballscrew + double ballnut came in at £170 this seems
> somewhat excessive. Does anyone know where I can find some that I am
> prepared to afford?
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
> --
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Re: [Emc-users] Spiral spring covers

[Leonardo Marsaglia]

Hello Andy.

May be this site could help you, they manufacture covers and I think they
can do what you need. I don't know about the cost but you can ask for
quotation. The only detail is their site doesn't seem to support english
although there's the EN button there. They are in Spain.

Here is the web:

http://lluiscreus.com/index.php?idioma=es

I hope you can find a reasonable price.

Leonardo.

2015-10-27 12:17 GMT-03:00 andy pugh :

> Does anyone know a cost-effective source of spiral spring covers?
>
> I have just been quoted £125 each for a pair of spiral spring
> leadscrew covers for my lathe (£318 delivered in VAT) by Beakbane. DQR
> didn't even bother to reply.
> Given that the ballscrew + double ballnut came in at £170 this seems
> somewhat excessive. Does anyone know where I can find some that I am
> prepared to afford?
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
> --
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>



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[Emc-users] Spiral spring covers

[andy pugh]

Does anyone know a cost-effective source of spiral spring covers?

I have just been quoted £125 each for a pair of spiral spring
leadscrew covers for my lathe (£318 delivered in VAT) by Beakbane. DQR
didn't even bother to reply.
Given that the ballscrew + double ballnut came in at £170 this seems
somewhat excessive. Does anyone know where I can find some that I am
prepared to afford?

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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