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Free Metalworking Project Plans: Adjustable Boring Head (Mill)


Material: Steel
Units: (in)

If you’re looking for an advanced project to tackle with your Mill, this is it. Once complete you’ll have a quality boring head without spending hundreds of dollars on one!

I’m planning on machining this project next, I’ll post pictures along the way. For now, here are the plans:

  Adjustable Boring Head (119.2 KiB, 5,448 downloads)
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About Tyler

Tyler is a hobby machinist and 3D printing aficionado. He teaches computer programming and web development at Highline College near Seattle. Tyler founded Projects In Metal in 2008 because he was frustrated by the lack of free plans available for hobby machinists.


  1. I recently did an associates degree and in my blueprint reading class they never taught me what v. means, all they taught was counterbores, countersinks and such but I dont recognize the V that is in the blueprint for the boring head. sheet 3 of 5 of the blueprints front view center hole right below the 9/32 counterbore. Usually we dont have an X there what does the X mean this is how I know it to be written: 9/32 meaning diameter of counterbore, .61 depth of counterbore. I dont understand what the x is suppose to be there for. As far as the V goes what does V mean? its the v.38x.30. there is more on the left view it shows the v9/32x.50 and under that it shows v13/32x.25 I drew this whole thing up on solidworks the hole in the nut does not line up with the hole in the dovetailed portion that has the hole for the 1/4 20 screw. I went over my prints over and over again trying to find some reason why it doesnt line up perfectly all I can think of is my holes are not accurate, but i cant see how they couldnt be accurate considering they receive a 1/4 20. If this message looks strange its because my wife dictated it for me she is so great to do such a thing for me, however I am an idiot because i dont know what the v thing stands for. Please help!

  2. If the V you're talking about looks a bit like a checkmark, it's a symbol for surface finish (how rough or smooth the part needs to be to function properly). I hope that helps.