H command

[jbelle7435]

I am running a Mitsubushi HA WEDM. I ran my 1st program for a .5000(+/-.0002) DIA hole only. The H value I had was H1 and it was pre-set to .0060".

 

 

With CCW and right compensation, my .5000(+/-.0002) DIA hole came out to .4975 so before I start making more passes to clean it up to a .5000 hole (ex. 1st .0006 and a 2nd .0012 large holes around it what does this H represent and if I had it set already at .0060 was that my 1st mistake and if H was another value could I get my .5000(+/-.0002) hole within tolerance on

ONE PASS ONLY??

 

Update: I found out about these Epak values and an H is already defined. Is it possible that the new H defined was overlapping the originally one. I still need a good understanding of H so I can take the guess work out trying to create a .5000(+/-.0002) hole like a good exmaple.

[Del.]

Jbelle, To obtain that accuracy I would take 1 rough pass and 3 skims. The H values are your offsets for each pass. They get smaller for each pass since the power settings are also different for each pass. Usually the first pass will leave about .002/side for 1st skim, about .0005/side for 2nnd skim, and .0002/side for 3rd skim. Each pass is leaving less to burn out and using lower power setting to obtain accuracy and finish.

 

A rough pass only will put you in the .001 range depending on thickness of part. I recommend you have your employer send you to some training for both the wedm and mastercam. It will help you a lot to understand what the wedm is doing.

[jbelle7435]

Jbelle, To obtain that accuracy I would take 1 rough pass and 3 skims. The H values are your offsets for each pass. They get smaller for each pass since the power settings are also different for each pass. Usually the first pass will leave about .002/side for 1st skim, about .0005/side for 2nnd skim, and .0002/side for 3rd skim. Each pass is leaving less to burn out and using lower power setting to obtain accuracy and finish.

 

A rough pass only will put you in the .001 range depending on thickness of part. I recommend you have your employer send you to some training for both the wedm and mastercam. It will help you a lot to understand what the wedm is doing.

 

are you familiar with lines of code that look like

 

N0001 F.09 H1 E692 M90;<---THIS IS WHERE THE ROUGH CUT AND SKIMS WILL OCCUR I assume

N0002 G01 G41 M88 X0 Y-.1250

N0003 G03 J-.2500

 

Some concerns..

 

1. Do I need the H1 in there if its defined already in the E692?

2. Do I need to actually start off with the rough cut of the E value specified??

3. When I make skim cut 1,2,etc do I copy the lines N0001,N0002,N0003 and place them below one another while updating the E value accordingly for the skim cuts(E691,E692,etc.)

example...

N0001 F.09 H1 E690 M90;

N0002 G01 G41 M88 X0 Y-.1250

N0003 G03 J-.2500

N0001 F.09 H1 E691 M90;

N0002 G01 G41 M88 X0 Y-.1250

N0003 G03 J-.2500

N0001 F.09 H1 E692 M90;

N0002 G01 G41 M88 X0 Y-.1250

N0003 G03 J-.2500

[Del.]

Jbelle, I am not familiar with your machine. I would think the H number is the offsets for each pass and the E692 are your power settings.F is probably your feed rate which also changes for each pass. I would assume both numbers would change for each pass you take. You should be able to set those conditions at your machine after you have loaded your program in the machine. Maybe someone else familiar with your machine could be of better help.

[jbelle7435]

Jbelle, I am not familiar with your machine. I would think the H number is the offsets for each pass and the E692 are your power settings.F is probably your feed rate which also changes for each pass. I would assume both numbers would change for each pass you take. You should be able to set those conditions at your machine after you have loaded your program in the machine. Maybe someone else familiar with your machine could be of better help.

 

Good news recently is I am doing test passes without the material but its going too fast still because the wire kept on breaking with the material so I am trying to figure why it worked previous(slower moving).