Author Topic: African Hardwood Leg Vice Screw  (Read 492 times)

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Offline carrera4s

  • Posts: 29
African Hardwood Leg Vice Screw
« on: June 25, 2020, 09:12 AM »
I am busy building a Roubo workbench and have recently finished the screw for the leg vice. The screw is made from leadwood (an indigenous South African hardwood), the handle from maple and the handle knobs from African Rosewood. The diameter of the screw is 64 mm (around 2 1/2 inches), the hub is around 125 mm (5"), the handle is about 30 mm (c 1 1/4"). Overall length is 640 mm (just under 26 inches). The No 4 Stanley is added for scale.

I had to build one custom jig for the internal threads and another router lathe for the external threads. A local engineering shop also made me a custom router bit for the internal threads.

The body of the screw was made from 70 x 70 mm square stock and turned to 64 mm diameter with a 50 mm tenon at the front end. It was then threaded. The hub was turned from a separate branch of the same type of wood (also leadwood) and a 50 mm hole drilled into the end. The main screw was then glued into the hub. A hole was then drilled and the handle added (the handle and knobs were also turned on the lathe).

I finished it with 3 coals of Danish Oil and then added Cobra floor polish to the threads to assist with smooth operation (that is the white you see on the photo - it makes a HUGE difference).

I must say, it turned out almost better than I thought! At one stage through the process I almost gave up, I tried a Beal type (Carter Whitling type) threading approach for the external threads but for some reason I just could not make it work...
I just need to edit my video a bit - will upload it once done and then you can see it in action.

Next up is the chop, will show it when done.

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Offline jeffinsgf

  • Retailer
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  • Posts: 301
Re: African Hardwood Leg Vice Screw
« Reply #1 on: June 25, 2020, 09:33 AM »
I love the natural edge hub. I would have never thought of that.

Online Birdhunter

  • Posts: 3051
  • Woodworker, Sportsman, Retired
Re: African Hardwood Leg Vice Screw
« Reply #2 on: June 25, 2020, 03:46 PM »
I enjoy watching a YouTube video series by Kieth Rucker and he’s an expert at cutting all types of threads on metal cutting lathes. I would appreciate seeing your method of cutting threads in wood.

Offline Rob Z

  • Posts: 993
Re: African Hardwood Leg Vice Screw
« Reply #3 on: June 25, 2020, 08:27 PM »
Looks like a nice project. Please post a pic once you've finished the bench.

I looked up 'leadwood' and one reference shows its density at 76 lbs per cubic foot. For comparison, white oak is listed at 47 lbs/cubic ft.  [eek]

Offline ear3

  • Posts: 4042
Re: African Hardwood Leg Vice Screw
« Reply #4 on: June 26, 2020, 12:13 AM »
Look forward to the video -- the wooden screw looks beautiful.
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Offline RJNeal

  • Posts: 516
Re: African Hardwood Leg Vice Screw
« Reply #5 on: June 26, 2020, 01:26 AM »
Sweet, looks good. Can wait to see the finish bench.
Have you walked your saw today?

Offline CeeJay

  • Posts: 112
Re: African Hardwood Leg Vice Screw
« Reply #6 on: June 26, 2020, 04:17 AM »
That’s a beautiful piece of work.

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Offline carrera4s

  • Posts: 29
Re: African Hardwood Leg Vice Screw
« Reply #7 on: June 26, 2020, 08:41 AM »
Thanks Guys,

Rob Z, yes, it is HEAVY.  I weighed one piece - 1 180 kg / cubic meter (74 lbs/cub ft).  Water is 1 000 kg / cubic meter, so this will sink in water.  In Afrikaans the local name is Hardekool ("hard coal" directly translated) - that is very apt, the wood is very hard, see these Janka Hardness for a few species:

White Oak:  1,350 lbf (5,990 N)
Hard Maple:   1,450 lbf (6,450 N)
Leadwood:  3,570 lbf (15,880 N) - almost 2.5x as hard as Oak or Maple

The last picture shows the chop: it was 19 kg (c 42 lbs), but it was too heavy, so I have cut it narrower, should be around 11 kg ( 24 lbs) now. Will hopefully have the chop done and installed by the end of next week.

I will posts pics of the full bench when done.