Thanks, Jon, this was very illuminating after many decades of lathe
turning practice!
Peter
Am 02.04.2014 19:22, schrieb Jon Elson:
> On 04/02/2014 08:39 AM, Peter Blodow wrote:
>> I don't even know what threading dials are and where they are installed,
>> sorry. I usually cut a thread up to a gi
On 4/2/2014 11:11 AM, Jon Elson wrote:
> On 04/01/2014 11:27 PM, Gregg Eshelman wrote:
>
> Oops, didn't read to the end.
>>
>> Or is there a single board that plugs into one parallel port, can run up
>> to four stepper drives, read up to four TTL quadrature scale/encoder
>> inputs, has an e-stop in
On Wednesday 02 April 2014 12:26:19 Peter Blodow did opine:
> Am 02.04.2014 14:11, schrieb andy pugh:
> > On 2 April 2014 12:54, Peter Blodow wrote:
> >> No problem with that, because reversing the drive is done with one
> >> lever, no cranking, no re-engaging, no dial or indicator necessary.
> >
On 04/02/2014 08:39 AM, Peter Blodow wrote:
>
> I don't even know what threading dials are and where they are installed,
> sorry. I usually cut a thread up to a given length, then stop and
> retract the tool in one instance. It's a two hand job. I can put the
> drive directly in reverse for a fract
On 04/01/2014 11:27 PM, Gregg Eshelman wrote:
Oops, didn't read to the end.
>
> Or is there a single board that plugs into one parallel port, can run up
> to four stepper drives, read up to four TTL quadrature scale/encoder
> inputs, has an e-stop input, limit switch inputs for 3 or 4 axes, can
>
On 04/01/2014 11:27 PM, Gregg Eshelman wrote:
> Now back to the question, now that it's established exactly what kind of
> signal the scales and encoder put out.
>
> What *hardware* do I need to interface them safely with a PC? I've read
> that it's "simple" to connect "directly" to a parallel port
Thanks, Andy,
I now see that I can get as old as a gnu and still learn dazu... Never
seen anything like that counter, and wouldn't know where to mount it on
the lathes I know. It's a good idea to make a run out groove that way -
I usually have to cut it right in the beginning (with a parting too
On 2 April 2014 14:39, Peter Blodow wrote:
> I don't even know what threading dials are and where they are installed,
Here is a typical one:
http://www.practicalmachinist.com/vb/attachments/f25/5191d1216225324-thread-dial-specs-9-junior-9-inch-thread-dial.jpg
It simply counts the leadscrew thre
Am 02.04.2014 14:11, schrieb andy pugh:
> On 2 April 2014 12:54, Peter Blodow wrote:
>
>> No problem with that, because reversing the drive is done with one
>> lever, no cranking, no re-engaging, no dial or indicator necessary. All
>> thread cutting is done this way over here in the shops, I've ne
On 2 April 2014 12:54, Peter Blodow wrote:
> No problem with that, because reversing the drive is done with one
> lever, no cranking, no re-engaging, no dial or indicator necessary. All
> thread cutting is done this way over here in the shops, I've never seen
> any other.
I would imagine that it
Am 02.04.2014 13:06, schrieb andy pugh:
> On 2 April 2014 11:29, Peter Blodow wrote:
>> There is no problem in disengaging the half nuts,
>> re-arranging things and closing again. Multiple pass cuts are, of
>> course, always done by retracting the tool und reversing the drive.
> The point is that
On 2 April 2014 11:29, Peter Blodow wrote:
> There is no problem in disengaging the half nuts,
> re-arranging things and closing again. Multiple pass cuts are, of
> course, always done by retracting the tool und reversing the drive.
The point is that you have to reverse the drive rather than dise
Not really, Jon, all the metric/Whitworth-conversion is done within the
feed gear box. I can select between 60 metric and imperial feed rates
each. I switch metric to imperial with the flic of one lever. This is
done, however, by a combination of gear wheels (34/26*79/41) to avoid
the use of a
On 2 April 2014 05:27, Gregg Eshelman wrote:
> Recommend something? I've searched some and findings range from "Yeah,
> TTL quadrature outputs can be connected to a parallel port." (without
> the author giving any specific details) to "Here's a schematic and a
> BOM, now get out your soldering ir
Do yourself a favor and do not go the cheapest route. You will burn
more time and find more frustration by going cheap.
If you look for and find an "exact fit", chances are you will need one
more input or one more output beyond what you bought.
You will know exactly how many inputs and outputs
Now back to the question, now that it's established exactly what kind of
signal the scales and encoder put out.
What *hardware* do I need to interface them safely with a PC? I've read
that it's "simple" to connect "directly" to a parallel port and a garden
variety LPT can handle two quadrature
On 04/01/2014 02:57 PM, Gregg Eshelman wrote:
> On 4/1/2014 7:01 AM, John Kasunich wrote:
>> On Tue, Apr 1, 2014, at 09:52 AM, Dave Cole wrote:
>>> Actually 127 Pulse/rev works ok.
>>>
>>> If you have 5 TPI screws it works out to: 0.2 / 127 = 0.00157" per
>>> pulse. If you count all of the edges
Electrically, yes if you use a microstepping drive. :-)
But if your ball screw has slop in it, then no. :-(
Dave
On 4/1/2014 2:57 PM, Gregg Eshelman wrote:
> On 4/1/2014 7:01 AM, John Kasunich wrote:
>> On Tue, Apr 1, 2014, at 09:52 AM, Dave Cole wrote:
>>> Actually 127 Pulse/rev works ok.
>
On 4/1/2014 9:32 AM, Peter Blodow wrote:
> Am 01.04.2014 15:01, schrieb John Kasunich:
>> 127 is an odd encoder count, but I understand why:
>> 0.000393" is 0.01mm.
>>
>> I wonder if this mill was used to make metric parts
>> and they wanted the control and readout to use
>> metric units natively?
On 4/1/2014 7:01 AM, John Kasunich wrote:
> On Tue, Apr 1, 2014, at 09:52 AM, Dave Cole wrote:
>> Actually 127 Pulse/rev works ok.
>>
>> If you have 5 TPI screws it works out to: 0.2 / 127 = 0.00157" per
>> pulse. If you count all of the edges of the full quad signal (which is
>> normal) you can
On 04/01/2014 10:32 AM, Peter Blodow wrote:
>
> Until the early 1990ies, many lathes were produced in Germany with inch
> screws and a 127 teeth gear wheel to drive them in order to end up with
> metric threads.
>
But that means you can't disengage the half nuts and
re-engage them
for the next thr
On 04/01/2014 08:01 AM, John Kasunich wrote:
>
> 127 is an odd encoder count, but I understand why:
> 0.000393" is 0.01mm.
>
> I wonder if this mill was used to make metric parts
> and they wanted the control and readout to use
> metric units natively?
>
Yup, any time I see encoders with 127 or 254
Am 01.04.2014 15:01, schrieb John Kasunich:
> 127 is an odd encoder count, but I understand why:
> 0.000393" is 0.01mm.
>
> I wonder if this mill was used to make metric parts
> and they wanted the control and readout to use
> metric units natively?
>
Until the early 1990ies, many lathes were produ
On Tue, Apr 1, 2014, at 09:52 AM, Dave Cole wrote:
> Actually 127 Pulse/rev works ok.
>
> If you have 5 TPI screws it works out to: 0.2 / 127 = 0.00157" per
> pulse. If you count all of the edges of the full quad signal (which is
> normal) you can divide that by 4 which is approximately .0015
Actually 127 Pulse/rev works ok.
If you have 5 TPI screws it works out to: 0.2 / 127 = 0.00157" per
pulse. If you count all of the edges of the full quad signal (which is
normal) you can divide that by 4 which is approximately .00157/4 =
.000393 in/count.
That seems adequate to me.
Dave
O
Specs on the rotary encoder.
3=Quadrature with index
25=0.25" bore
127=127 pulse/rev Probably way too coarse. Apparently super Z axis
accuracy wasn't real important on this mill back in 1990.
All three ball screws are 5 TPI.
On 3/31/2014 7:22 AM, Dave Cole wrote:
> The scales should not be a
On 3/31/2014 6:22 AM, andy pugh wrote:
> On 31 March 2014 07:02, Gregg Eshelman wrote:
>
>> Specs I've found is they're 10 micron, 0.0004" resolution, square wave
>> TTL output.
>
> That should work with any hardware, including the parallel port.
Got a datasheet from BEI on the encoder.
3=Quadra
On 31 March 2014 07:02, Gregg Eshelman wrote:
> Specs I've found is they're 10 micron, 0.0004" resolution, square wave
> TTL output.
That should work with any hardware, including the parallel port.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
The scales should not be a problem. TTL encoder inputs are common on the
Mesa boards.
You will need to look up that BEI encoder to find the specs.
TTL or differential line driver are common.
I've been using the Mesa 7i43 with a 16 in 8 out I/O board ( 7i37TA) and
either the servo (7i33TA) or th
Anilam System A-10 pinout
pin 1: A chan (white)
pin 2: NC
pin3: COM (black)
pin4: B chan (green)
pin5: NC
pin6: +5V (red)
pin7: marker pulse (brown)
pin8: NC
Specs I've found is they're 10 micron, 0.0004" resolution, square wave
TTL output.
I have 1600 oz/in stepper motors on the mill. The Z ax
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