Topics

X travel not working


Cap'n Stab'n
 

I have a Compact 5 CNC, All of a suddent the stepper motor that drives the tooling (left and right directions) stopped working. The motor itself is good still, it's moving. I thought it might be the belt that connects the stem if the motor to the driving stem of the drive screw, so I ordered one of those, same problem. It looks like I need to tension the belt somehow. Am I missing something?

Thanks, Nic


aushacker
 
Edited

Hi Nic,
with the stepper motor and drive belt removed:
1) are you able to move the lead screw gear easily by hand?
2) can you jog the stepper motor and easily stall the shaft with your fingers?

Regards,
Stephen


Cap'n Stab'n
 

Hi, Stephen. 

I can jog the motor by hand, but it won't stall if I jog it using the machine. It almost seems like the belt isn't gripping the gear and shaft. It just stopped one day


aushacker
 

You could try swapping the X and Z belts.


Cap'n Stab'n
 

Are they the same size? 


cjlear
 

On 14/01/2019 2:18 pm, nic.shimala@... wrote:
I have a Compact 5 CNC, All of a suddent the stepper motor that drives the tooling (left and right directions) stopped working. The motor itself is good still, it's moving. I thought it might be the belt that connects the stem if the motor to the driving stem of the drive screw, so I ordered one of those, same problem. It looks like I need to tension the belt somehow. Am I missing something?

Nic, sounds like a belt pulley is slipping, probably something as simple as a loose grubscrew that holds it to the shaft.

Stick your finger up underneath the gearbox just inboard of the motor housing, you'll feel the bottom of the pulley and belt. Roll it with your finger.

Does the saddle move?

  • No, then the problem is probably the pulley on the feed screw.
  • Yes, then the problem is probably the pulley on the motor. Turn on the machine. Try to roll it again. If you can move the saddle with the machine on, then the pulley is definitely loose on the motor.

From memory they are just held on with a grubscrew, its late and I can't find my spare steppers to be sure, but you've already had them apart to replace the belt so switch the machine off, whip the motor off and check the pulleys are tight.

Let us know how you get on.

Cheers

 Charlie



David Rabenius
 

Sounds like the pulley pin that connects the pulley to the shaft somehow sheared off or got loose. Did you have a crash or stall the axis somehow?
Other than that remove the belt and turn the stepper by hand, if it spins on the stepper shaft then you need to look at the pulley shaft pin for damage.
--------------------------------------------

On Mon, 1/14/19, cjlear <tools@...> wrote:

Subject: Re: [Emco-CNC-Users] X travel not working
To: Emco-CNC-Users@groups.io
Date: Monday, January 14, 2019, 7:02 AM


On 14/01/2019
2:18 pm,
nic.shimala@...
wrote:




I have a Compact 5 CNC, All of a suddent the stepper
motor that
drives the tooling (left and right directions) stopped
working.
The motor itself is good still, it's moving. I
thought it might be
the belt that connects the stem if the motor to the
driving stem
of the drive screw, so I ordered one of those, same
problem. It
looks like I need to tension the belt somehow. Am I
missing
something?


Nic, sounds like a belt pulley is slipping, probably
something as
simple as a loose grubscrew that holds it to the
shaft.


Stick your finger up underneath the gearbox just
inboard of the
motor housing, you'll feel the bottom of the
pulley and belt. Roll
it with your finger.


Does the saddle move?


No, then the problem is probably the pulley on
the feed screw.Yes, then the problem is probably
the pulley on the motor.
Turn on the machine. Try to roll it again. If you
can move the
saddle with the machine on, then the pulley is
definitely loose
on the motor.
From memory they are just held on with a grubscrew,
its late and
I can't find my spare steppers to be sure, but
you've already had
them apart to replace the belt so switch the machine
off, whip the
motor off and check the pulleys are tight.
Let us know how you get on.
Cheers
 Charlie


David Rabenius
 

--------------------------------------------
Your pulley should look like this with the pinned shaft.

On Mon, 1/14/19, David Rabenius via Groups.Io <swedeson2002=yahoo.com@groups.io> wrote:

Subject: Re: [Emco-CNC-Users] X travel not working
To: Emco-CNC-Users@groups.io
Date: Monday, January 14, 2019, 9:03 AM

Sounds like the pulley pin that connects the
pulley to the shaft somehow sheared off or got loose. 
Did you have a crash or stall the axis somehow?
Other than that remove the belt and
turn the stepper by hand, if it spins on the stepper shaft
then you need to look at the pulley shaft pin for damage.
--------------------------------------------
On Mon, 1/14/19, cjlear <tools@...>
wrote:

Subject: Re: [Emco-CNC-Users] X travel
not working
To: Emco-CNC-Users@groups.io
Date: Monday, January 14, 2019, 7:02
AM


    On 14/01/2019
2:18 pm,
      nic.shimala@...
wrote:

   
   
     
      I have a Compact
5 CNC, All of a suddent the stepper
motor that
      drives the
tooling (left and right directions) stopped
working.
      The motor itself
is good still, it's moving. I
thought it might be
      the belt that
connects the stem if the motor to the
driving stem
      of the drive
screw, so I ordered one of those, same
problem. It
      looks like I need
to tension the belt somehow. Am I
missing
      something?

   
    Nic, sounds like a belt
pulley is slipping, probably
something as
      simple as a loose
grubscrew that holds it to the
shaft.

   
    Stick your finger up
underneath the gearbox just
inboard of the
      motor housing,
you'll feel the bottom of the
pulley and belt. Roll
      it with your
finger.

   
    Does the saddle move?

   
    No, then the problem is
probably the pulley on
the feed screw.Yes, then the problem
is probably
the pulley on the motor.
        Turn on
the machine. Try to roll it again. If you
can move the
        saddle
with the machine on, then the pulley is
definitely loose
        on the
motor.
    From memory they are
just held on with a grubscrew,
its late and
      I can't find my
spare steppers to be sure, but
you've already had
      them apart to
replace the belt so switch the machine
off, whip the
      motor off and
check the pulleys are tight.
    Let us know how you get
on.
    Cheers
     Charlie


David Rabenius
 

www.practicalmachinist.com/vb/cnc-machining/beginners-80-rebuild-emco-compact-5-cnc-lathe-193493/

Sorry about the pic not loading.
--------------------------------------------

On Mon, 1/14/19, David Rabenius via Groups.Io <swedeson2002=yahoo.com@groups.io> wrote:

Subject: Re: [Emco-CNC-Users] X travel not working
To: Emco-CNC-Users@groups.io
Date: Monday, January 14, 2019, 9:12 AM

--------------------------------------------
Your pulley should look like this with
the pinned shaft.



On Mon, 1/14/19, David Rabenius via
Groups.Io <swedeson2002=yahoo.com@groups.io>
wrote:

Subject: Re: [Emco-CNC-Users] X travel
not working
To: Emco-CNC-Users@groups.io
Date: Monday, January 14, 2019, 9:03
AM

Sounds like the pulley pin that
connects the
pulley to the shaft somehow sheared
off or got loose. 
Did you have a crash or stall the axis
somehow?
Other than that remove the belt and
turn the stepper by hand, if it spins
on the stepper shaft
then you need to look at the pulley
shaft pin for damage.

--------------------------------------------
On Mon, 1/14/19, cjlear <tools@...>
wrote:

  Subject: Re: [Emco-CNC-Users] X
travel
not working
  To: Emco-CNC-Users@groups.io
  Date: Monday, January 14, 2019,
7:02
AM


     On 14/01/2019
  2:18 pm,
       nic.shimala@...
  wrote:

   
   
     
       I have a Compact
5 CNC, All of a suddent the stepper
  motor that
       drives the
tooling (left and right directions)
stopped
  working.
       The motor itself
is good still, it's moving. I
  thought it might be
       the belt that
connects the stem if the motor to the
  driving stem
       of the drive
screw, so I ordered one of those,
same
  problem. It
       looks like I need
to tension the belt somehow. Am I
  missing
       something?

   
     Nic, sounds like a belt
pulley is slipping, probably
  something as
       simple as a loose
grubscrew that holds it to the
  shaft.

   
     Stick your finger up
underneath the gearbox just
  inboard of the
       motor housing,
you'll feel the bottom of the
  pulley and belt. Roll
       it with your
finger.

   
     Does the saddle move?

   
     No, then the problem is
probably the pulley on
  the feed screw.Yes, then the
problem
is probably
  the pulley on the motor.
         Turn on
the machine. Try to roll it again. If
you
  can move the
         saddle
with the machine on, then the pulley
is
  definitely loose
         on the
motor.
     From memory they are
just held on with a grubscrew,
  its late and
       I can't find my
spare steppers to be sure, but
  you've already had
       them apart to
replace the belt so switch the
machine
  off, whip the
       motor off and
check the pulleys are tight.
     Let us know how you get
on.
     Cheers
      Charlie


Cap'n Stab'n
 

I'll check that out once I get to the house. Thanks guys,

Nic

On Mon, Jan 14, 2019 at 8:33 AM David Rabenius via Groups.Io <swedeson2002=yahoo.com@groups.io> wrote:
www.practicalmachinist.com/vb/cnc-machining/beginners-80-rebuild-emco-compact-5-cnc-lathe-193493/

Sorry about the pic not loading.
--------------------------------------------
On Mon, 1/14/19, David Rabenius via Groups.Io <swedeson2002=yahoo.com@groups.io> wrote:

 Subject: Re: [Emco-CNC-Users] X travel not working
 To: Emco-CNC-Users@groups.io
 Date: Monday, January 14, 2019, 9:12 AM

 --------------------------------------------
 Your pulley should look like this with
 the pinned shaft.



 On Mon, 1/14/19, David Rabenius via
 Groups.Io <swedeson2002=yahoo.com@groups.io>
 wrote:

  Subject: Re: [Emco-CNC-Users] X travel
 not working
  To: Emco-CNC-Users@groups.io
  Date: Monday, January 14, 2019, 9:03
 AM

  Sounds like the pulley pin that
 connects the
  pulley to the shaft somehow sheared
 off or got loose. 
  Did you have a crash or stall the axis
 somehow?
  Other than that remove the belt and
  turn the stepper by hand, if it spins
 on the stepper shaft
  then you need to look at the pulley
 shaft pin for damage.

 --------------------------------------------
  On Mon, 1/14/19, cjlear <tools@...>
  wrote:

   Subject: Re: [Emco-CNC-Users] X
 travel
  not working
   To: Emco-CNC-Users@groups.io
   Date: Monday, January 14, 2019,
 7:02
  AM


       On 14/01/2019
   2:18 pm,
         nic.shimala@...
   wrote:

     
     
       
         I have a Compact
  5 CNC, All of a suddent the stepper
   motor that
         drives the
  tooling (left and right directions)
 stopped
   working.
         The motor itself
  is good still, it's moving. I
   thought it might be
         the belt that
  connects the stem if the motor to the
   driving stem
         of the drive
  screw, so I ordered one of those,
 same
   problem. It
         looks like I need
  to tension the belt somehow. Am I
   missing
         something?

     
       Nic, sounds like a belt
  pulley is slipping, probably
   something as
         simple as a loose
  grubscrew that holds it to the
   shaft.

     
       Stick your finger up
  underneath the gearbox just
   inboard of the
         motor housing,
  you'll feel the bottom of the
   pulley and belt. Roll
         it with your
  finger.

     
       Does the saddle move?

     
       No, then the problem is
  probably the pulley on
   the feed screw.Yes, then the
 problem
  is probably
   the pulley on the motor.
           Turn on
  the machine. Try to roll it again. If
 you
   can move the
           saddle
  with the machine on, then the pulley
 is
   definitely loose
           on the
  motor.
       From memory they are
  just held on with a grubscrew,
   its late and
         I can't find my
  spare steppers to be sure, but
   you've already had
         them apart to
  replace the belt so switch the
 machine
   off, whip the
         motor off and
  check the pulleys are tight.
       Let us know how you get
  on.
       Cheers
        Charlie

     
     

     
   










Cap'n Stab'n
 

Sorry it took so long to get to this. With the motor off lathe but connected to its wires, there is no movement from the motor. It sounds like its trying, but theres no movement. The driving collar is tight and the shaft moves freely when the power is off. I also noticed something a bit off putting. When I touch the motor housing to the lathe body, there's some small sparks.

Thanks for any information on this issue,
Nic

On Mon, Jan 14, 2019, 15:45 Cap'n Stab'n via Groups.Io <nic.shimala=gmail.com@groups.io wrote:
I'll check that out once I get to the house. Thanks guys,

Nic

On Mon, Jan 14, 2019 at 8:33 AM David Rabenius via Groups.Io <swedeson2002=yahoo.com@groups.io> wrote:
www.practicalmachinist.com/vb/cnc-machining/beginners-80-rebuild-emco-compact-5-cnc-lathe-193493/

Sorry about the pic not loading.
--------------------------------------------
On Mon, 1/14/19, David Rabenius via Groups.Io <swedeson2002=yahoo.com@groups.io> wrote:

 Subject: Re: [Emco-CNC-Users] X travel not working
 To: Emco-CNC-Users@groups.io
 Date: Monday, January 14, 2019, 9:12 AM

 --------------------------------------------
 Your pulley should look like this with
 the pinned shaft.



 On Mon, 1/14/19, David Rabenius via
 Groups.Io <swedeson2002=yahoo.com@groups.io>
 wrote:

  Subject: Re: [Emco-CNC-Users] X travel
 not working
  To: Emco-CNC-Users@groups.io
  Date: Monday, January 14, 2019, 9:03
 AM

  Sounds like the pulley pin that
 connects the
  pulley to the shaft somehow sheared
 off or got loose. 
  Did you have a crash or stall the axis
 somehow?
  Other than that remove the belt and
  turn the stepper by hand, if it spins
 on the stepper shaft
  then you need to look at the pulley
 shaft pin for damage.

 --------------------------------------------
  On Mon, 1/14/19, cjlear <tools@...>
  wrote:

   Subject: Re: [Emco-CNC-Users] X
 travel
  not working
   To: Emco-CNC-Users@groups.io
   Date: Monday, January 14, 2019,
 7:02
  AM


       On 14/01/2019
   2:18 pm,
         nic.shimala@...
   wrote:

     
     
       
         I have a Compact
  5 CNC, All of a suddent the stepper
   motor that
         drives the
  tooling (left and right directions)
 stopped
   working.
         The motor itself
  is good still, it's moving. I
   thought it might be
         the belt that
  connects the stem if the motor to the
   driving stem
         of the drive
  screw, so I ordered one of those,
 same
   problem. It
         looks like I need
  to tension the belt somehow. Am I
   missing
         something?

     
       Nic, sounds like a belt
  pulley is slipping, probably
   something as
         simple as a loose
  grubscrew that holds it to the
   shaft.

     
       Stick your finger up
  underneath the gearbox just
   inboard of the
         motor housing,
  you'll feel the bottom of the
   pulley and belt. Roll
         it with your
  finger.

     
       Does the saddle move?

     
       No, then the problem is
  probably the pulley on
   the feed screw.Yes, then the
 problem
  is probably
   the pulley on the motor.
           Turn on
  the machine. Try to roll it again. If
 you
   can move the
           saddle
  with the machine on, then the pulley
 is
   definitely loose
           on the
  motor.
       From memory they are
  just held on with a grubscrew,
   its late and
         I can't find my
  spare steppers to be sure, but
   you've already had
         them apart to
  replace the belt so switch the
 machine
   off, whip the
         motor off and
  check the pulleys are tight.
       Let us know how you get
  on.
       Cheers
        Charlie