Re: real time linux

D Murphy wrote:
> "John R. Carroll" <jcarroll@xxxxxxxxxxxxxxxxxxxxx> wrote in
> news:Pmktf.7034$oW.5938@xxxxxxxxxxxxxxxxxxxxxxxxxx:
>
>> D Murphy wrote:
>>> Cliff <Clhuprich@xxxxxxx> wrote in
>>> news:ohcbr1t8olufpamlqtg9l6qh726erri3ic@xxxxxxx:
>>>
>>>> On Fri, 30 Dec 2005 22:16:29 GMT, "John R. Carroll"
>>>> <jcarroll@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>
>>>>> Cliff wrote:
>>>>>> On Fri, 30 Dec 2005 21:08:16 GMT, "John R. Carroll"
>>>>>> <jcarroll@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>>>
>>>>>>> Cliff wrote:
>>>>>>>> On Fri, 30 Dec 2005 19:05:08 GMT, "John R. Carroll"
>>>>>>>> <jcarroll@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>>>>>
>>>
>>> This technology has been in use for something like a dozen or so
>>> years on CNC screw machines. I don't know why it's taken so long to
>>> be adapted to CNC milling.
>>
>> Two reasons I think.
>> 1) CNC Screw machines never had good CAM products to support them.
>> 2) Good CAM for milling has blocked the market in many ways. Entry is
>> harder.
>
> Interesting. I was thinking along those same lines. Also it's woth
> noting that Tornos holds a patent (5,327,352) on this technology. They
> were doing this with Fanuc 0T controls early on. It could end up being
> another "Hurco" situation. But I don't know as much about the other
> systems as I do the Tornos PNC to make any judgements.
>
> I'm sure the other control builders believe they have found a way
> around the patent. Since Fanuc worked with Tornos developing the PNC
> system, I would be surprised to see them offering a rip-off of this
> patent anytime soon.
>
>>
>> Heidenhain and Mazak can both read a step file at this point and once
>> you provide the necessary info, they cut your part.
>> This may not be for sale yet but the newest 530i's have this as an
>> option IIRC.
>> Check with the guys at DMG if you have a minute at your next trade
>> show. They'll know for sure.
>>
>
> I know that the Siemens control can do this. Star is using it on their
> ECAS machines. In a screw machine the speed differential between this
> technology and say a three path control has shrunk to the point where
> other factors such as the machine construction can make the difference
> of which machine is faster. But the geometry in a typical screw
> machine part is fairly straght forward. I would like to see what it
> looks like when applied to a complex high speed machining operation.
>
> One of the technical issues that gets overlooked is that by its nature
> this type of system is open loop. It really shouldn't be a problem
> with the types of drives available today, but I can see where it
> would be a factor in certain applications.

The loop is closed Dan, just not the way you are used to seeing it closed.
All of the data is precompiled and checked in advance so all you need to do
is close the internal servo loop and not the entire process. You are still
accurately moving the machine but the loop is "pre closed" if you will. As
long as your hardware doesn't bomb out on you you have gotten the woopsies
out of the process in advance of the drives ever seeing a single thing.


This is what the Heidenhain solution looks like internally.


1) Tell the machine about the part:

BEGIN PGM 1 MM
BLK FORM 0.1 Z X-50. Y-50. Z0.
BLK FORM 0.2 X50. Y50. Z100.
;
* - BAUTEILNAME DMU50EV_MSSI.vmp
;

Tell the control to pay attention:

* - EILGAENGE

Tell the machine to load the the stock model:

FN 0: Q30 =50000 ; EILGANG
FN 0: Q33 =10000 ; ABFAHRVORSCHUB
;
* - A-45. C-90.
* - Standard Drill
* -
MSYS/50.000000,-50.000000,75.000000,0.000000,1.000000,0.000000,-0.707107,0.0
00000,0.707107,0.707107,0.000000,0.707107
* - GAGELENGTH/90.000000


* - VHM SPIBO 9.9

Tell the machine what feature to machine:

TOOL CALL 0 Z S0.0 DL0 DR0
M13
CALL LBL 99


All of this stuff comes from the uploaded CAD database, internal kinematics
model and the internal tool library, just like Seimens.
STEP is a standard so it is possible to have certain expectations about what
is avaliable:

FN 0: Q31 =0 ; FRAESVORSCHUB
FN 0: Q32 =1000 ; Z-VORSCHUB
;
L X50. Y17.678 R0 FQ33 M7
L Z10. R0 FQ30
CYCL DEF 200 BOHREN ~
Q200=+2 ;SICHERHEITS-ABST. ~
Q201=-15.283364 ;TIEFE ~
Q206=+Q31 ;VORSCHUB TIEFENZ. ~
Q202=+15.283364 ;ZUSTELL-TIEFE ~
Q210=+0 ;VERWEILZEIT OBEN ~
Q203=+0 ;KOOR. OBERFLAECHE ~
Q204=+50 ;2. SICHERHEITS-ABST. ~
Q211=+0 ;VERWEILZEIT UNTEN
L X50. Y17.678 R0 F MAX M99
L Z10. FQ21
* - Standard Drill


Now you go do it.

The STEP standard is fully open. The machining algorithms aren't but can be
made so if desired.
As a former application guy, you could teach a control to do what you want,
the way you want it done and then ship that knoweledge base with the other
standard AI to the customer. IOW, custom canned cycles if you will. The
necessary slicing and dicing is done internally and compiled into binary
drive source, stored and then executed.

Voila. No mas external CAM system and you can build increasing intelligence
into the technology as you go.

--
John R. Carroll
Machining Solution Software, Inc.
Los Angeles San Francisco
www.machiningsolution.com


.

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