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Offline Graham Waterworth

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Re: motor tuning
« Reply #30 on: December 06, 2006, 09:32:42 PM »
I think it rhymes with Clucking Bell. :D

Its 2:30 am here, I will be back tomorrow, email me all your latest files.

Graham.
Without engineers the world stops
Re: motor tuning
« Reply #31 on: December 06, 2006, 09:34:22 PM »
thanks Graham, BTW it 1:30 here (Oh that would be PM ----Sorry,  me so silly,..... LOL )

Offline Graham Waterworth

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Re: motor tuning
« Reply #32 on: December 08, 2006, 04:20:31 AM »
Hi Salty72,

sorry could not get back sooner, I had a busy one yesterday.

Try this new and improved version (sounds like washing powder ad).

Graham.
« Last Edit: December 08, 2006, 04:26:51 AM by Graham Waterworth »
Without engineers the world stops
Re: motor tuning
« Reply #33 on: December 10, 2006, 05:51:01 PM »
graham,

    Thanks for the NEW improved File, (it washes clothes well !) Seriously I have just downloaded it so haven't had a chance to try it out...

One thing I did notice was that every second line had Xnn, Ynn, R1.5 and then the next line had the Xnn Ynn Znn. will this not create a slight scollop shape  befor the drop in Z-height?  (I also added the G94 [feed per mm] as I have no feed back to the spindle for a G95 [feed per RREV] )


    What was the reasoning for adding the R1.5..?

Over the week end I was having a think (couldn't do much else as I fell through the Ceiling onto the CNC table and have hurt my back aslo brused my pride rather surverly) if I can set the Zheight then carry out a Xnn Ynn Inn Jnn G-code would this give me a smoother cutting file, I realise that the Zhieght would remain constant but because of the shape I would either be cutting less or more material depending on where about on the shape I was cutting??


Offline Graham Waterworth

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Re: motor tuning
« Reply #34 on: December 10, 2006, 06:38:07 PM »
I converted the whole geometry into a 3d polyline to get rid of the lumps and bumps.

Try it as it is and let me know what happens.

If you need to rough it out first just off set the Z axis up by about 24mm and then run a cut, then keep dropping it by 3mm or so and re run again.  keep doing this until you get back to the proper depth.

Graham.

Without engineers the world stops
Re: motor tuning
« Reply #35 on: December 13, 2006, 08:07:39 PM »
the file with the R1.5 give little scollups around the edge of the sunnies, I noticed that the stop start motion was worse in one direction than the other,

I looked closer, to see that if I applied pressure to the gantry the stop/start action was remarkably reduced, further investigation showed the stepper was loose the vibration of cutting with the 55mm Cutter and the larger router must be loosening the bolts (the stepper is mounted upside down and is suspended by 4 hex bolts I have since added LOCTITE and will hope this problem is fully resolved,

feed and speed are set to 400mm/Sec with 6000RPM on a 2.5mm Standard two flute end mill.

I will post a video tonight for all to see...

thanks for your help...

Ps how do you tell if the speed it to fast or that the cutter is the wrong style

Offline Graham Waterworth

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Re: motor tuning
« Reply #36 on: December 14, 2006, 07:39:08 AM »
You can calculate the spindle speed using this formula :-

In imperial measuments.

Alum, Brass, Copper, Plastics = 200ft/min
Mild steel                           = 100ft/min
Alloy steel                          = 80ft/min
Stainless Steel                    = 40ft/min
Titanium                            = 30ft/min
High tensile alloy steels        = 15ft/min

RPM =      S(ft/min)
         --------------------------
         0.2618* Cutter Dia

So in plastic with a 1/8 cutter

RPM =     200
         ----------------
        0.2618*.125

RPM = 6116

Graham.
Without engineers the world stops