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Larken > Larken replacement parts

Thread: Larken replacement parts

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\r\n New member here. I bought a Larken 24/24 back in I believe 2004(?). I must say it has performed incredibly well. My only problem is once in a while the X or Y axis will get "stuck". I have read that the machines this old had Pacific Scientific steppers that were almost under powered for the machine (100 oz-in. torque). I have two questions:
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\n1. Does anyone have the replacement part number for the X and Y lead screw nuts? I believe Larken uses Kerk Leadscrews (Now Haydon?). I could take the nuts off and figure out the lead, etc. but I would rather order the nuts and then replace and not have to be down for a week. I think Larry has stated that he specially machines the Z nut. I really can\'t complain - almost 11 years and I have not changed or had to replace anything on this CNC router. (I have rebuilt 2 Bosch routers on the spindle).
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\n2. To address the potentially under powered motors, has anyone replaced their motors? If so what brand, holding torque, phase current (amps), and voltage. I believe the motor drivers in my controller are only rated for 2 amps to drive the motors. The Pacific Scientific motors are labelled P224RHS-LNN-NS-02 with 1.8 degree step, 3.1 amp, bipolar parallel. I have great success with this machine and would like to boost the motor power without changing anything else.
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\nAt some point I know I will have to update to a windows based controller. For now I am OK with windows 98 for my controller. Any help would be greatly appreciated. Thanks.\r\n
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    \r\n Re: Larken replacement parts\r\n

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    \r\n After looking at the most recent build pics of the Larken shop, I have found what appears to be the X and Y lead screw nut part number. There is a bag of the nuts with Kerk part numbers on them.
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    \r\nZBX-ANR-050-0333-8200
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    \r\nZBX - anti-backlash style
    \r\nA - Triangular Flange Mount
    \r\nN - No lubricant
    \r\nR - Right Hand thread
    \r\n050 - Lead Screw Diameter - 1/2"
    \r\n0333 - Lead Screw Pitch - 0.333"
    \r\n8200 - Not sure - I think it is a customer assigned number to make ordering easier for Larken\r\n
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    \r\n Re: Larken replacement parts\r\n

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    \r\n OK.....I have another question. Larken had told me I could go to new motors and drivers and told me to set the drivers to 800 steps/turn. I checked my Larken 24/24 today in regards to the lead on the leadscrew. I measured the linear motion on one motor turn and it was .333 in. This does not seem to compute with Larry saying to set the drivers to 800 steps / turn. There is no gearhead or gearing so wouldn\'t a 1.8 degree step motor and a 0.333 in lead equate to 600 steps / turn?
    \r\nAny input would be appreciated. Thanks.\r\n
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    \r\n Re: Larken replacement parts\r\n

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    \r\n Maybe he means set the drives to 1/4 step, or 800 steps per motor revolution.\r\n
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    Gerry
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    \nUCCNC 2017 Screenset
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    \nMach3 2010 Screenset
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    \nJointCAM - CNC Dovetails & Box Joints
    \nhttp://www.g-forcecnc.com/jointcam.html
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    \n(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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    \r\n Re: Larken replacement parts\r\n

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    \r\n Quote Originally Posted by ger21\r\n View Post\r\n
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    Maybe he means set the drives to 1/4 step, or 800 steps per motor revolution.
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    I believe you are correct - Thank you!\r\n
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    \r\n Re: Larken replacement parts\r\n

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    \r\n Quote Originally Posted by ger21\r\n View Post\r\n
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    Maybe he means set the drives to 1/4 step, or 800 steps per motor revolution.
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    Yes, the drives are set to 800 steps/rev so the x and y axis (3tpi screw) has 2400 steps/inch. On the Z axis the screw is 5tpi so its 4000 steps/inch.
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    \nLarry\r\n
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    Manufacturer of CNC routers and Viper Servo Drives
    \r\n www.LarkenCNC.com and www.Viperservo.com
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    1. 09-26-2015, 07:23 PM #1
      ulijdavid
      ulijdavid is offline Registered
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      Larken replacement parts

      New member here. I bought a Larken 24/24 back in I believe 2004(?). I must say it has performed incredibly well. My only problem is once in a while the X or Y axis will get "stuck". I have read that the machines this old had Pacific Scientific steppers that were almost under powered for the machine (100 oz-in. torque). I have two questions:

      1. Does anyone have the replacement part number for the X and Y lead screw nuts? I believe Larken uses Kerk Leadscrews (Now Haydon?). I could take the nuts off and figure out the lead, etc. but I would rather order the nuts and then replace and not have to be down for a week. I think Larry has stated that he specially machines the Z nut. I really can't complain - almost 11 years and I have not changed or had to replace anything on this CNC router. (I have rebuilt 2 Bosch routers on the spindle).

      2. To address the potentially under powered motors, has anyone replaced their motors? If so what brand, holding torque, phase current (amps), and voltage. I believe the motor drivers in my controller are only rated for 2 amps to drive the motors. The Pacific Scientific motors are labelled P224RHS-LNN-NS-02 with 1.8 degree step, 3.1 amp, bipolar parallel. I have great success with this machine and would like to boost the motor power without changing anything else.

      At some point I know I will have to update to a windows based controller. For now I am OK with windows 98 for my controller. Any help would be greatly appreciated. Thanks.
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