H-Mortiser ‘Godzilla’ Modification

I can already tell that this is going to be one of those jigs that I continue to upgrade. I borrowed another design element from Woodgears and used his one-handed lever mechanism. What a huge improvement!

I still need to come up with a solution to keep sawdust from getting on the shafts in the X,Y tables. This needs more thought. If you have an idea please let me know. Thanks!

4 Responses to “H-Mortiser ‘Godzilla’ Modification”

  1. Richard says:

    Instead of trying to keep sawdust from getting on the rods think about installing some kind of wiper at each bearing simillar to what they use on hydraulic cylinders. they would clean the rods as the table moved.

    • GarageWoodworks says:

      I’m not familiar with these. I wonder if they would also wipe oil from the shaft? I need to look into this more. Thanks!

  2. Russ says:

    Yes the wiper was the same thing I was thinking, http://www.amazon.com/All-Balls-1984-1988-Davidson-04-5314/dp/B0012TWSDU

    This is a seal for wheels but like a rear seal for a engine or transmisson, I think you would need to go to a cycle shop to find something small enough though.

    I also bought the plans from woodgears and was thinking the same thing with rods and bushings (much more stable).

    Is there a problem with the sliding of the shaft because of sawdust building up on the rod? I would think of the tight tolerance of the rod and the bushing the sawdust would just fall off when it hits the bushing.

    Can you tell me what size rod you used? I plan on using 3/4″ since I have a good supply of ground & polished rod.

    • Garagewoodworks says:

      Russ – The bushings slid really well when I first built it, but have tightened up a little since then, but still very functional. The problem I encountered is that the bushings are sintered and oil filled. I seated the bushings into wooden blocks that were unsealed in the bore hole. The wood wicked out all or most of the oil. If I were to make this again I would seal the inside of the hole where the bushings are mounted to prevent this. This should keep it sliding nicely!

      Sawdust is actually not a problem. The bushings are so tight around the rods, that there is no room for sawdust to enter underneath. Any sawdust is just pushed out of the way by the bushing. The shafts I used were 5/8″ in diameter. I posted links below to were I purchased mine.

      Good luck with your build. Please e-mail me a picture when you finish it!

      -Brian

      Shaft: http://tinyurl.com/2bcgykv
      Bushings: http://tinyurl.com/22ll654

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