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Messages - Tweakie.CNC

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8131
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: June 29, 2010, 08:44:28 AM »
Hi Dan,

There are many different combination's of metals / alloys which exhibit potential differences which change with temperature variation, the most common being the Type K which is Nickel-Chrome / Nickel-Aluminum alloys. Fortunately, for me the different types are color coded so at least I know what type it is that I found in my stores. One thing is curious though the Ni-Cr is non-magnetic but the Ni-Al is magnetic ???.
This explains thermocouples better than I can. http://en.wikipedia.org/wiki/Thermocouple

Best regards,

Tweakie.

8132
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: June 29, 2010, 05:26:09 AM »
Well I couldn’t find a thermocouple of the right design (I want to monitor the temperature of the cooling fluid as it leaves the laser tube with perhaps a second sensor to monitor the coolant entering the tube) so I decided to make my own. On the offchance anyone is interested in thermocouples I have attached a few pictures…..

1.   Piece of 6mm bore stainless tube and length of ‘Type K’ thermocouple wire.
2.   This is the tricky bit, the wires are spot welded onto the tube one on top of the other.
3.   With a simple mold I have used some car body filler to support the wires and give some protection to the weld.
4.   Completed tubular thermocouple which, with a bit of insulation, should indicate the flowing water temperature.
5.   Tested and it works.

Tweakie.

8133
Hi Ian,

Quote
fingers too fast for brain - why does that make any difference?

The faster an axis takes off from a standing start and the quicker it stops the less drawn out the unwanted increase in depth of cut at the start and finish of the kerf becomes. (on wood this is shown as a dot at each end of a line - quick acceleration, small dot - slow acceleration, bigger dot).

Quote
5000mm/sec^2 (velocity 15000mm/min)

You must have super low mass in your axis to achieve that Velocity and acceleration. My poor little steppers might just about manage a squeak.  ;D

Tweakie.

8134
Hi Ian,

Thanks for the info, I must look into this a bit more then. I didn't actually measure anything, just looked at the results in a piece of scrap perspex.
Just out of curiosity and assuming you have a better memory than me, what acceleration figure were you using for your X -Y axis ?.

Tweakie.

8135
Hi Ian,

Thank you for the link, which I had not seen before. I have just given this a try (got quite excited) and although it may speed the Output # ? switching time there is still a delay before the next line of code is executed when using M3 or M1001.
With cutting acrylic this delay is unimportant to me it is just with engraving where the depth varies at the start and end of the kerf.
It is so annoying that the E1P1/E1P0 works so well... 'when it works'.  :(  :'(

Tweakie.

8136
Hi Hood,

Thanks for your response - Yes it is for no delay, or switching at the point of the axis movement, for a laser.

Funny enough the M10 /M11 combo also suffer similar, although slightly different, behavior. There is definitely something strange here as I have tried different computers with the same result.

I have attached a modified (m10/m11) version of the earlier GCode just in case anyone wants to see the difference.

Tweakie

8137
I am having an issue with switching output #1 with the commands E1P1 and E1P0.

For most of a program it works just fine then suddenly gets confused (particularly with short moves) then returns to working just fine again.
Despite much experimentation I have not been able to get to the bottom of this or find the cure.

If anyone has experienced this problem and discovered the reason or found a cure I would be most grateful to learn the answer.

I have attached a simple GCode which exhibits this problem.

Thanks,

Tweakie.

8138
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: June 27, 2010, 01:27:28 AM »
Think I have done it this time fellas. The temperature controller arrived yesterday, it's bigger than I had originally thought and gray paint or not, I can't find anywhere to fit it.  :'(
I haven't found the right thermocouple yet so I may try my hand at making one (if I can find my spot welder which I don't think I have used in the last 10 years).

Tweakie.

8139
Show"N"Tell ( Your Machines) / Re: 7X14 MINI LATHE - CNC CONVERSION
« on: June 26, 2010, 12:08:13 PM »
Looking forward to reading all about this Rich.

Tweakie.

8140
General Mach Discussion / Re: help with DC DC converter
« on: June 26, 2010, 12:03:59 PM »
Hi again,

I have searched the internet for more info on this assembled AFC5 device of yours without success.
My suggestion is that you forget about it - a dc to dc converter in itself would do little if anything to reduce any electrical noise in a CNC system anyway. If you feel that you have a noise problem then some very good tips have been detailed by Bob Warfield both here http://www.cnccookbook.com/CCCNCNoise.html as well as on this forum.

Sorry I can't be of more help.
Best regards,

Tweakie.


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