Changing Speeds on 8" Drill Press

Discussion in 'Off-Topic' started by nDever, Feb 19, 2015.

  1. nDever

    Thread Starter Active Member

    Jan 13, 2011
    154
    4
    Hey Guys,

    I'm back with my drill press from Harbor Freight. If you posted on my problem thread (http://forum.allaboutcircuits.com/threads/pcb-drilling-solutions.105969/), then you know that I bought this primarily for PCB hole drilling. It works great, and it was a perfect solution; I've made a few boards already!

    My problem now is that I need to switch to a higher speed. The manual said that I needed to change the position of the drive belt, but it's significantly tight and I don't want to break it. Does anyone who has this drill know what the problem is?

    [​IMG]
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,699
    907
    There should be a way to loosen the motor mounting rods and slide the motor to the front. It looks like there may be a lock on the RH side. From the design, there may be a lock on both sides. The belt does not have to be real tight. You also remove from the large pulley first. I went to "link belt" for my drill press (e.g.,http://www.zoro.com/i/G3722311/?utm...hopping_Feed&gclid=COjuuu6B78MCFYk8gQodFqQAig). It runs much smoother.

    John
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,571
    2,381
    It looks almost identical to mine, there is a tensioner on the same side as the lid latch that removes the tension on the belt for changing.
    You may want to look at a DC T.M. motor and simple controller and get rid of the belt nuisance, especially for light work such as electronics.
    Max.
     
  4. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,699
    907
    I switched to a 3φ motor and never regretted it. The DC or 3 phase work about the same in this application, but the 3 phase motor may be cheaper. Mine was a slightly bigger drill press, and the bigger 3 phase motor was quite inexpensive. Both will give soft start. The 3 phase will also give a little "overspeed;" whereas, there is nothing faster than 100% for the DC motor.

    John
     
  5. nDever

    Thread Starter Active Member

    Jan 13, 2011
    154
    4
    Thanks guys, I finally figured it out.
     
  6. #12

    Expert

    Nov 30, 2010
    16,354
    6,852
    Other options that might not be practical or even possible:
    1) Increase the size of the pulley on the motor shaft
    2) Buy a faster motor.
     
  7. Nykolas

    Member

    Aug 27, 2013
    87
    31
    This is what I use: http://www.harborfreight.com/vibration-free-link-belt-43771.html on a similar Craftsman press. I am waiting for a used 90VDC motor to replace the AC unit and have complete electronic speed control. My press did not come with a light. I installed a 10W LED between the drill shaft and the main post. Electronics inside the hollow casting. E
     
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