At 04:45 PM 4/2/2010, you wrote:
In the end I went for a fast rotary axis based on a 3/4
straight-shank ER32 collet chuck from eBay (about £15) with a 6:1 belt
drive to a NEMA 23 stepper. This is held between taper-roller bearings
in a housing that bolts to the table.
The hob is mounted in the
Hi Andy:
Just wanted to say thanks for showing ur video of hobbing. It inspires the
rest of us to get off our a-- and do something. did u make the indexing
fixture your self??
Really cool:
Bill
On Sat, 3 Apr 2010 01:20:34 +0100
Andy Pugh a...@andypugh.fsnet.co.uk wrote:
On 3 April
Anyway, on the basis that a picture is worth a thousand words, here
are approximatelt 2000 pictures.
http://www.youtube.com/watch?v=ZhICrb0Tbn4
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The video is great, so is the result.
But the captions from youtube are hilarious ;) sounds like it has a bit
of a problem with your
Frank Tkalcevic wrote:
Nope, you are exactly right. On both accounts. Turning the spindle by hand
will make Z move until it gets to the Z specified in G33/33.1 then stop.
G33.1 will move back, but only when it is within the G33.1 bounds.
Are you sure? When the tap reaches the
Jon Elson wrote:
Frank Tkalcevic wrote:
Nope, you are exactly right. On both accounts. Turning the spindle by hand
will make Z move until it gets to the Z specified in G33/33.1 then stop.
G33.1 will move back, but only when it is within the G33.1 bounds.
Are you sure?
driving the spindle with an MPG would allow EMC2 to tap a hole in manual
mode - interesting no?
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Stuart Stevenson wrote:
driving the spindle with an MPG would allow EMC2 to tap a hole in manual
mode - interesting no?
Would be, if EMC2 actually geared to the spindle ;)
You wouldn't be able to do the 1/2 turn forward/1/4 turn back method
though.
(which would have been much much easier
using the hobbing setup should allow the spindle to drive a linear axis
instead of rotary axis then MPG tapping is possible
On Sat, Apr 3, 2010 at 12:26 PM, Stephen Wille Padnos spad...@sover.netwrote:
Stuart Stevenson wrote:
driving the spindle with an MPG would allow EMC2 to tap a hole in
In the end I went for a fast rotary axis based on a 3/4
straight-shank ER32 collet chuck from eBay (about £15) with a 6:1 belt
drive to a NEMA 23 stepper. This is held between taper-roller bearings
in a housing that bolts to the table.
The hob is mounted in the milling spindle, and the spindle is
That is really nicely done.
In the HAL file there is a direct link from the spindle
position to the rotary axis position, with a scaling factor
to suit the number of teeth to be cut. This keeps the two
axes in permanent synchronisation.
Which pins to you connect together? I want to be
On Sat, Apr 03, 2010 at 09:19:35AM +1100, Frank Tkalcevic wrote:
Which pins to you connect together? I want to be able to do this to keep a
dial indicator in the groove of a ballscrew when I try to center it in the
lathe. When I turn the chuck, I want the feedscrew to move.
You could just
On 2 April 2010 23:19, Frank Tkalcevic fr...@franksworkshop.com.au wrote:
Which pins to you connect together? I want to be able to do this to keep a
dial indicator in the groove of a ballscrew when I try to center it in the
lathe. When I turn the chuck, I want the feedscrew to move.
It was
Which pins to you connect together? I want to be able to
do this to
keep a dial indicator in the groove of a ballscrew when I try to
center it in the lathe. When I turn the chuck, I want the
feedscrew to move.
It was (hm2_7i43.0.).encoder.00.position = mult2.in
mult2.out =
On 3 April 2010 01:07, Frank Tkalcevic fr...@franksworkshop.com.au wrote:
G33 sounds more complicated. Won't G33 have problems requiring the spindle
turning under power, being at-speed, and then synching with index pulse?
The spindle definitely does not need to be under power or at-speed. I
Andy Pugh wrote:
On 3 April 2010 01:07, Frank Tkalcevicfr...@franksworkshop.com.au wrote:
G33 sounds more complicated. Won't G33 have problems requiring the spindle
turning under power, being at-speed, and then synching with index pulse?
The spindle definitely does not need to be
-Original Message-
From: Stephen Wille Padnos [mailto:spad...@sover.net]
Sent: Saturday, 3 April 2010 11:54 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Hobbing
Andy Pugh wrote:
On 3 April 2010 01:07, Frank
Tkalcevicfr...@franksworkshop.com.au wrote
On Sat, Mar 06, 2010 at 12:31:04PM +, Andy Pugh wrote:
On 6 March 2010 07:58, Erik Christiansen dva...@internode.on.net wrote:
From the photographs, that makes
the feed perpendicular to the hob axis, which seems to me to ignore the
helix angle. How that creates a spur gear with proper
For a helical gear the blank rotates and its no longer a simple 40:1
for a 40 tooth helical gear, a mechanical hobbing machine has a
differencial gear to add or subtract the rotation with cut.
see diagram at top of page http://www.collection.archivist.info/hobbing.html
I have done the maths in
On 7 March 2010 11:41, Dave Caroline dave.thearchiv...@gmail.com wrote:
see diagram at top of page http://www.collection.archivist.info/hobbing.html
Ah, yes that is where I saw that diagram.
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On 7 March 2010 09:29, Erik Christiansen dva...@internode.on.net wrote:
The hob must always cut at the gear helix angle, so that alone
determines the hob helix positioning. The hob axis then ends up where
the hob helix puts it. There does not appear to be any options there.
(According to the
On Fri, Mar 05, 2010 at 01:23:46PM +, Andy Pugh wrote:
I am thinking of making a faster rotary axis using an ER32 collet
holder I have on a 3/4 ground shaft and some taper roller bearings. I
would drive that with a spare stepper I have, at about 10:1 ratio. (or
one of the little servos)
Looks nice Ian but I would love to measure the wheel for errors in
tooth to tooth distance. We had trouble directly attributable to the
worm and wheel in a bought dividing head, we made some 144 tooth
wheels for a project at the BHI and they were rightly rejected, for
normal clock work the error
On 6 March 2010 07:58, Erik Christiansen dva...@internode.on.net wrote:
In MEW 75, another author used a couple of CMOS chips for the
programmable divider between the spindle encoder and stepper driver, to
select the number of teeth.
This is very easy to set up in HAL (and quite amusing too,
Hi Dave,
I haven't checked the wheel for accuracy but I would think that this
method of generation actually is less prone to errors than methods which
cut each tooth separately. Once the teeth are established as to number
and you infeed the wheel onto the tap, there are always at least 3
On Fri, 2010-03-05 at 13:23 +, Andy Pugh wrote:
... snip
I am unsatisfied with the results of my attempts at gear-milling. I
think this stems partly from me not knowing which of the three cutters
I have is for what tooth count, or what the addendum and dedendum is
meant to be for each
On 5 March 2010 18:10, Kirk Wallace kwall...@wallacecompany.com wrote:
The problems with trying to replicate hobbing with CNC rotary axes are,
the rotary encoders would need to be very high resolution, feedback and
command control very tight, and data throughput high enough to keep up.
I
On 05/03/2010 18:10, Kirk Wallace wrote:
The problems with trying to replicate hobbing with CNC rotary axes are,
the rotary encoders would need to be very high resolution, feedback and
command control very tight, and data throughput high enough to keep up.
I think it has been stated before
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