Messages

3931

General Mach Discussion / Re: Problem with Backlash...

« on: January 04, 2011, 08:43:29 PM »

It's interesting to have a read of all the different manuals as all of them are similar but may add a few additional words about backlash.
In the lathe manual it states backlash will prevent the effective operation of CV.
In the Mach3 software installation and configuration manual it says"Using it will generally disable the CV features at corners and Mach cannot fully honor
axis acceleration parameters when compensating for backlash and detune the stepper to avoid lost steps.
Then you have the Shuttle Accel comment from Hood posted ( it's not mentioned as such in the Using Mach3 Mill manual).
So each wording gives rise to a little different understanding to the user.

So responses to problems are use exact stop, adjust motor tuning and backlash settings. No exact answers when one considers all the differences in machines.
It falls on the user to find what works for them.

The Shuttle Wheel Accel is in seconds. How exactly is the" time" applied to the backlash "cycle"? Well I don't really know. It's internal to Mach.
By observing the difference in how the motor reacts to different settings you will see that it affects the overall time it takes
for Mach to take up the backlash and at say a value of 5 you will find that over five seconds the handwheel / shaft will turn rather slowly.
At 0.005 sec its almost instantaneous. In the real slow setting, and say you jog a distance of .1"  you will find there seems to be almost 3 distinct
motor responses in the cycle,....... a small rotation then deceleration...... then backlash taken up over a time...and then  accel and move to finish the distance.
So to get of flavor of it you need to start slow, observe, listen to see what is happening over an operating range. Work your way up in settings.

RICH

3932

Works in progress / Re: Looking for O.D grinder Mach3 screen.

« on: January 04, 2011, 05:49:00 PM »

I have never seen one posted in here. In fact, very seldom see any posts relative to grinding.
RICH

3933

LazyCam (Beta) / Re: Hey Rich

« on: January 04, 2011, 05:35:54 PM »

I use Win XPPro and have not upgraded or plan to upgrade to Win7 in the near future so don't know any quirks of it.
Some programs will not migrate  / can be run on Win7-64 home addition.........so my friends have told me.
 
Could it be a permissions thing in Win7?

Other than that i am at a loss for obvious reasons.
RICH

3934

Video P*r*o*b*i*n*g / Re: Problem with index signal

« on: January 04, 2011, 05:06:50 PM »

Mach uses a single index slot and not multiple. There is no real advantage and was changed some time ago.
Change your configuration accordingly from timing to index.
RICH

3935

General Mach Discussion / Re: Making a list of things that need fixed in Turn

« on: January 04, 2011, 06:53:12 AM »

Until the G83 gets fixed for the lathe you can use the lathe drilling Macro done by Melee.
Here is the link and the file contains a description for using it. Can also drill multiple offset holes with it. 

http://www.machsupport.com/forum/index.php/topic,15205.msg101682.html#msg101682

RICH

3936

General Mach Discussion / Re: DB-200S Spindle USA

« on: January 04, 2011, 06:38:14 AM »

I think Little Machine shop sells a kit or a small one. Don't think the spindle has any adapters for small internal grinding. A smaller electric die grinder mounted on the carriage may be just as good and
is a whole lot cheaper and uses a collet for mounting of the stones. Makita sells one along with a fixture to hold it horizontally.

COMMENT: Sold my toolpost grinders. I think it's the worst add on a person can have for a lathe. The grind dust goes all over the place no matter how you
cover up the lathe. Clean up is just a PITA.

My comment .......your lathe,
RICH

3937

General Mach Discussion / Re: DB-200S Spindle USA

« on: January 03, 2011, 05:16:59 PM »

Nicolas,
Suggest you just start looking at all the different tooling catalogs and see what you come up with. How to compare them is another story.
The prices run the range from say $50 to $1000 plus. You never know what's inside and just how they are made.
Example; ground end, balanced, high end bearings, hardened shafts, size of shaft and beaings, etc. Lets not forget the type chuck on the end or how the collet is made.
Kind of tough to judge the quality just on price.

Designing and making your owne is certainly an a good option.

LOL,
RICH

 

3938

General Mach Discussion / Re: A axis

« on: January 02, 2011, 09:32:25 PM »

stepper as a spindle

I would guess that the max you will get out of a stepper will be like 1000 rpm ( maybe less but you'll find out ) and no torque so yo will need some ratio increase to increase the rpm.
Additionaly if you try to control it you may find out that the stepper speed will not be linear ie; rpm increase is not linear as you increase the speed due to
torque falling off and the influence of increased torque required  to turn the spindle it's driving.
Just something you should be aware of.
RICH

3939

General Mach Discussion / Re: DB-200S Spindle USA

« on: January 02, 2011, 09:05:11 PM »

There is another one listed which has 2 high speed bearings which may be better for what you plan on doing with it ( additional $60 ).
Both should work for engraving as the cut depths are going to be rather shallow. The motors look like the high speed motors used on sewing machines.
There was a guy on ebay custom making them and quality look excelant some time ago. That end play is good and 1/2 thou runout will become two or three at the end of
a small end mill just somethng to note. End play is important since in fine engraving you want to be able to control the depth quite accurately and end play can start to play
 in to what you may want todo.

I use hand pieces which are driven by a flex shaft and the motor is 1/4 hp. Machine Al 1/8" deep at slow ipm....small stuff. Never have any problems just doing engraving work.
To share my experience on using it for 3 axis work where i let it run for 4 hours or more my hand piece is getting up around 150 deg F and it sits inside a big block of AL.
No problem with the motor but i know that the bearings won't hold up / i dont konw when they will give out. I can always replace them and should add some cooling to the spindle.
Mine are  modified spindles from Grizzly and they are better than all the Foredom ones at less  than 1/3 the price.
Link shows some of the spindles i use:

http://www.machsupport.com/forum/index.php/topic,12484.msg88231.html#msg88231

The air driven ones ( Dumore, Dotco, Ingersoll Rand ) are noisy i may add. Would drive you insane if run for 4 hours!

Just some info FWIW,
RICH

3940

Show"N"Tell ( Your Machines) / Re: 1987 Bridgeport Production Center Interact 412 to Mach3 Conversion

« on: January 02, 2011, 08:13:29 PM »

So what is the first part that your going to make for a chopper?
RICH