On May 23, 2020, at 7:15 AM, Randy Child via <strongman_one@...> wrote:

The holes I reamed, I reamed to a slight hair below 26mm..the ID hole on the bearing is 10mm..I used a 10mm bolt to secure everything together

On Saturday, May 23, 2020, 06:38:41 AM PDT, imranindiana via <imranindiana@...> wrote:

Randy,

I guess the nut at bottom is smaller than the ID of the bearing. I have only seen smaller reamers and the nut or the threaded rod is close to the size of the reamer OD. Just was curious how you achieved flat bottom.

Imran

On May 23, 2020, at 9:22 AM, Randy Child via <strongman_one@...> wrote:

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Thanks Imran.. the reamer I used was an adjustable reamer.. works exactly like you described.. I had to adjust it 4 or 5 times till the desired size was achieved..

On Saturday, May 23, 2020, 05:49:53 AM PDT, imranindiana via <imranindiana@...> wrote:

Randy,

Well done. Looks great. What kind of reamer did you use? Ones I have seen work for thru holes with adjusting nut on the bottom.

Imran

On May 23, 2020, at 8:34 AM, Randy Child via <strongman_one@...> wrote:

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I will say, the seating of the bearing in the aluminum took a little time.? I used 4" wide x 6" long x 5/16" thick 6061 aluminum plates.? I put some green masking tape on both plates and used CA glue to glue the 2 plates together so they would not move.? I used a 15/16" drill bit ( bearings are 26mm in dia.) and drilled the holes on both ends of the plates,? Took a chisel and separated the plates after all the holes were drilled and then used an adjustable reamer to ream open the holes drilled for the bearings until the holes were just right and pressed the bearings in..The are seated very tightly and will not budge.? This is what prevents the sag of the arms when assembled?

On Friday, May 22, 2020, 09:53:15 PM PDT, joelgelman via <joelgelman@...> wrote:

For the mid-section of what I hope will be the super-easy-and-inexpensive-to-make-in-your-shop version, I made a quick demo of the plan for the pivot mechanism (gear will be used but omitted at this time). ?In picture 1, you see a 2 inch Forstner bit being used to drill partially through one of the pieces. ?The center indentation can be a guide for the drilling of the smaller hole in the middle for the bolt. ?Another way to insure a dead center hole is to clamp the workpiece, and change bits without moving the wood. ?Figure 2 shows a nice fit of the 2 inch OD angled thrust bearing. ?After the hole is bored (figure 3), a hole is bored in the other piece of wood, and with washers, and a nut and bolt, the units are assembled. ?For those who do not want to deal with seating bearings in aluminum, this bearing method may work well. ?I just need to make sure there will be adequate strength in the wood.?