Messages

31

General Mach Discussion / Re: Axis Drive Design Helper Spreadsheet

« on: October 27, 2009, 06:26:43 PM »

Here is the formula for the thrust at target feedrate for both metric and inch: IF(B6="Stepper";IF(B3="Metric";B49*B30*B22*6280/B27;B49*B30*B22*0,392/B27);"")

Edit: I think......  

More edit: Changed the constant "6140" to "6280"

Yet more edit: Changed the constant "0,384" to "0,392"

32

General Mach Discussion / Re: Axis Drive Design Helper Spreadsheet

« on: October 27, 2009, 04:31:26 PM »

B30*B49*B22*6140/B27

This is the formula for the thrust at target feedrate for the stepper at metric mode.

Edit: The 6140 constant is replacing PI and pitch conversion.

More edit: I think this works for both metric and inch: B30*B22*B49*6,14/B29

Yet more edit: It certainly does not work for both!

33

General Mach Discussion / Re: Axis Drive Design Helper Spreadsheet

« on: October 27, 2009, 04:12:27 PM »

Hi Ray,

very nice spreadsheet you have made

However there seems to be some errors still. Motor power at target feedrate both stepper and servo and thrust at target feedrate for servo. I'm working on correcting the formulas even if I'm not familiar with the new versions of excel.

Edit: This is for the metric version. I havent checked the Inch version.

34

General Mach Discussion / Re: Licensing issues

« on: October 23, 2009, 01:43:07 PM »

Fastest, try this to remove the incorrect file association: right click the file, select "open in", select "select program". In the dialog box that opens now, DESELECT the "always open in", then open with any program, then close. I think the incorrect association should be erased now.

I haven't the english version of Xp so I'm not sure what the english boxes says. Maybe it says "open with" instead of "open in".

35

Show"N"Tell ( Your Machines) / Re: gears, ballscrews, and setscrews

« on: October 23, 2009, 04:09:31 AM »

If you don't do anything then it will be hard to get the gear off because of the burrs made by the set screw when you tighten it. I would have drilled a shallow recession in the shaft with a drill bit somewhat larger than the diameter of the set screw. Don't drill it deep! Only so deep that the diameter of the recession becomes slightly larger than the set screw. Then it should not be any problem removing the gear later. If the gear doesn't fit tight on the shaft I would have used locktite on the shaft also.

36

Tangent Corner / Re: Mystery object ?.

« on: October 22, 2009, 10:45:00 AM »

It looks like it is a spring of some sort.

37

General Mach Discussion / Re: Problems threading on the lathe

« on: October 22, 2009, 09:53:30 AM »

I have lost some of the information here since long. If I remember correctly the RPM measurement is done before each pass but only ONE RPM is measured. In order to minimize the trigger deviation, if there is any, could it be an idea to measure the time of say 5 full revolutions and divide that time by 5 to get the RPM as accurate as possible?

38

Show"N"Tell ( Your Machines) / Re: The Laser Project.

« on: October 22, 2009, 02:38:19 AM »

Thanks Guys.

I keep wondering if the cooling system will be man enough for the job. 

Tweakie.

Well, maybe one more fan to be sure it can handle the load

39

Show"N"Tell ( Your Machines) / Re: The Laser Project.

« on: October 21, 2009, 01:30:06 PM »

Looking very good 

It's a hefty cooling system you have installed.

40

General Mach Discussion / Re: Problems threading on the lathe

« on: October 17, 2009, 02:23:01 AM »

Art,
If I read the debug correctly it is 4 rpm measurments or 4 full rotations before each pass starts. If these rpm measurments differ, what rpm is the motion planned for? The last rpm measurment or an average of the 4 rpm measurments?