Messages

2431

General Mach Discussion / NPT THREADING ON THE LATHE - USING THE SIMPLE THREADING WIZARD

« on: September 16, 2012, 10:39:20 AM »

Attached is a rough draft for how to cut  NPT threads using the Simple Threading (lathe) wizard. You won't find much,if any, concise info
on using it for this task. I was asked to do some tappered threads and it's been a "few years" since doing one.

It was desirable to do the threading in a precise way. The result is the rough writeup attached.
Any comments appreciated. Will probably put the final version in Members Doc's or the Threading on the Lathe Manual as an appendix.

BTW, if interested and want night time reading on tappered threads, have a read of ANSI-B1.20.1, 3, 5.    

RICH

2432

G-Code, CAD, and CAM discussions / Re: Bobcad feed and speeds are wrong when loading in mach3 Newbie

« on: September 16, 2012, 09:50:17 AM »

Rune,
Have a look at the thread END MILL SPEEDS AND FEEDS in Members Doc's. It provides basic information and suggested rates for machining.
A program calculates based on some generic info ( actualy over time studies have been done to arrive at the info basis). Thus  if your system can't do what the calculated basis was ( ie; not many spindles turn at 24,000 rpm) then you need to modify the feedrate for the spindle speed you will be using. Additionaly, machining experience certainly can be the deciding factor. ie; If your machine has backlash,you can snap
a small end mill in a heartbeat.

RICH

2433

G-Code, CAD, and CAM discussions / Re: Bobcad feed and speeds are wrong when loading in mach3 Newbie

« on: September 15, 2012, 06:39:58 AM »

Can't have a feedrate which greater than your machines is capable of, same goes for a spindle rpm ( 24000 rpm used in calc).
RICH

2434

General Mach Discussion / Re: pulse rating

« on: September 15, 2012, 06:31:41 AM »

Have you defined the port address?
RICH

2435

General Mach Discussion / Re: Bit Location

« on: September 15, 2012, 06:28:33 AM »

You can place the bit anywhere you want,but, would recommend a starting point X/Y/Z =0 at a place you could duplicate or maybe at an important feature.

RICH

2436

General Mach Discussion / Re: Myford Super 7 - adding ball screws

« on: September 13, 2012, 06:16:46 AM »

Hood,
Sorry, yes my screw is turning. Hmm..Eyes reading and engaged but brain not functioning yet.
To early in the morning.

RICH

2437

General Mach Discussion / Re: 4 axis problems

« on: September 12, 2012, 08:25:02 PM »

Don't know ....Mach implements the code given to it and the code needs to be correct for how Mach is configured.
RICH

2438

General Mach Discussion / Re: Myford Super 7 - adding ball screws

« on: September 12, 2012, 05:19:54 PM »

I did what Terry suggested. You may want to have a look at my Atlas conversion as I cover most of the steps.
http://www.machsupport.com/forum/index.php/topic,12484.msg80823.html#msg80823
I anchored both ends of the screw and one anchored end allows for adjusting preload of the Z. Did the same for the X axis.
Look at the pics carefully and you will see how the Z screw was adjusted from intial installation to final.

To proteact the screw i just mounted some Al angles which telescope to protect the screw. It works great.

It took a little bit more effort to make the screws adjustable but it paid off in the end. BTW, I use a torque gage to test/adjust and know just how much torque each component is using.

Have fun....
RICH

2439

General Mach Discussion / Re: 4 axis problems

« on: September 12, 2012, 04:58:36 PM »

Y0u will find it under General Config, lower center of the screen "Rotational". There are three settings and what each does is in the Mach Manual.
RICH

2440

G-Code, CAD, and CAM discussions / Re: Newbie Checking in and saying Hello

« on: September 12, 2012, 11:45:45 AM »

The book is very comprehensive.
RICH