Project of the Month built by edholly
Home Model Engine Machinist > CNC > Software and Programming > Counter Clockwise Spindle

Reply
 
Thread Tools
Old 09-29-2009, 07:26 PM   #1
Jack
 
Jack's Avatar
 
Join Date: Jul 2007
Posts: 178
Liked 11 Times on 7 Posts
Likes Given: 5

Default Counter Clockwise Spindle

I am trying to setup my new CNC version of my mill and one of the parameters is to turn on the spindle in counter clockwise direction.


Jack is offline  
 
Reply With Quote
Old 09-29-2009, 07:34 PM   #2
GailInNM
Administrator
HMEM_ADMIN.png
 
GailInNM's Avatar
 
Join Date: Feb 2008
Location: Albuquerque, NM, USA
Posts: 2,111
Liked 279 Times on 235 Posts
Likes Given: 109

Default Re: Counter Clockwise Spindle

Jack,
Many milling machines, like Bridgeport and BP clones, have a high low range gear in the head. When the low range is engaged the spindle reverses direction relative to the motor, so you have to start the motor in the reverse direction to get normal rotation.
Gail in NM


__________________
Gail in New Mexico, USA
I would like to be the kind of person my dog thinks I am.
GailInNM is offline  
 
Reply With Quote
Old 09-29-2009, 09:01 PM   #3
vlmarshall
 
vlmarshall's Avatar
 
Join Date: Dec 2008
Posts: 1,138
Liked 55 Times on 55 Posts

Default Re: Counter Clockwise Spindle

Rigid tapping, if you ever expand that far, requires driving the spindle in reverse, to get the tap out of the hole. For most of us at home, CNC-controlled tapping is a distant dream.
__________________
Chesapeake, Virginia, USA, Northern Hemisphere, Earth, Sol system, Orion Spur, Milky Way.

Sherline 5400 mill, Xylotex drivers and EMC controller
Sherline 4400 lathe, Gecko drivers and EMC controller
vlmarshall is offline  
 
Reply With Quote
Old 09-29-2009, 09:05 PM   #4
vlmarshall
 
vlmarshall's Avatar
 
Join Date: Dec 2008
Posts: 1,138
Liked 55 Times on 55 Posts

Default Re: Counter Clockwise Spindle

Also, when long stringy drill swarf is unavoidable, I've added a quick M05 at the end of the drill cycle, to clear off the ball of steel-wool forming around the drill. Again, not normally an issue at home... I only WISH I had an automatic tool changer on my own mill.
Still, The people making CNC interpreters like the Linux-based EMC have tried to expand the program to cover any possibilites, as its been used to run even very large industrial machines.
__________________
Chesapeake, Virginia, USA, Northern Hemisphere, Earth, Sol system, Orion Spur, Milky Way.

Sherline 5400 mill, Xylotex drivers and EMC controller
Sherline 4400 lathe, Gecko drivers and EMC controller
vlmarshall is offline  
 
Reply With Quote
Old 09-30-2009, 03:38 AM   #5
rake60
HMEM_LIFETIMESUPPORTER.png
 
rake60's Avatar
 
Join Date: Jul 2007
Posts: 4,769
Liked 218 Times on 193 Posts

Default Re: Counter Clockwise Spindle

I have written and run programs that were to drive a large tap
where the mill spindle didn't have the torque to do the job.
The program was written to lock the mill spindle to a lathe condition
and turn the chuck spindle the number of turns to cut the internal
thread to depth. Then, an M04 code would reverse the chuck spindle
rotation to allow the tap to exit the hole. I run Mazak Mazatrol programs
where Tool Path Control entries are required in the program are required
to be sure the tool will return to it's home position without trying to go
through the work piece. That is the one + for G code. In G code you
have to program every move. Mazatrol is very much easier to program
but if you forget a TPC you are going to do a lot of damage to the machine
faster than you could ever hope to react.

Rick
__________________
Seriously, how many times can THAT happen in one day?
rake60 is offline  
 
Reply With Quote
Old 10-09-2009, 01:38 AM   #6
dieselpilot
 
Join Date: Jan 2009
Location: Chicagoland
Posts: 1,272
Liked 105 Times on 94 Posts
Likes Given: 3

Default Re: Counter Clockwise Spindle

What are left hand endmills for then? I see them occasionally in catalogs.


dieselpilot is offline  
 
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Concrete counter tops?? lazylathe General Engine Discussion 66 02-09-2012 09:37 AM
Counter balance? robcas631 General Engine Discussion 3 10-19-2011 02:35 PM
Micro counter bores? #1 #2 etc.? Chitownmachine Tools 3 01-31-2011 03:14 PM
Taig mill counter balance unit toolsrul Machine Modifications 6 11-24-2009 10:39 AM
Counter Sink Cutter Bernd Tools 2 02-01-2008 01:11 AM



Newest Threads






- Top - Member List