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Pete. (l33t FS)
Pete. (l33t FS) GRM+ Memberand MegaDork
2/18/24 9:30 a.m.
Patrick said:

In reply to TurnerX19 :

They're also extremely good for cooking food

Seems kind of weird, but we at GRM can do anything with a tool, I guess

TurnerX19 UberDork
2/19/24 9:00 a.m.

In reply to Pete. (l33t FS) :

Replying to both P & P, I never quote the primary purpose for a tool, too obvious, and all the hammer forming Trent is doing, how did he pass them up?

Trent PowerDork
3/30/24 12:54 p.m.

Time to remake the front upper control arms. Starting with a jig. I reamed to hole for the ball joint taper and located my inner pivot block to set the length. 

Let's make a block to hold the ball joint. 

I really need a proper 4 jaw with a DI6 back plate.

Press fit, augmented with the snap rings

On the plate!

Next step, have send cut send laser out some eccentric washers

And then modify some 8mm SHCS


Next step, on to the adjuster ends......


Trent PowerDork
3/30/24 4:56 p.m.

1X0.75 steel bar, turned to a spigot on one end.

Roughed out on the band saw

You see where I am going here? A total of 6mm of adjustment via the eccentric cam.


And then connect the dots with some 3/4" 4140 

Complete arm is 904 grams. The alloy arm was 1340 grams 

One more item checked off the list.

Next step, revisit the lower arms.


Pete. (l33t FS)
Pete. (l33t FS) GRM+ Memberand MegaDork
3/30/24 5:22 p.m.

I was wondering why you had SCS make parts that one could easily buy off the shelf, but now I see the scale.  Fascinating!

Trent PowerDork
3/30/24 5:28 p.m.

In reply to Pete. (l33t FS) :

Yeah. 20mm OD eccentric stuff didn't seem to exist. laugh

TurboFource Dork
3/30/24 7:17 p.m.

Excellent work!

Shavarsh HalfDork
3/31/24 1:12 p.m.

Wow, brilliant work. I love the image of the 3 jaw holding th 4 jaw. What kind of interference did you aim for on the ball joint press fit?

Trent PowerDork
3/31/24 1:53 p.m.

I'll have to double check my notes, but the ball joint was knurled and measured something like 38.04mm so I went to 38.00 and it pressed in like one would expect with an arbor press.

It is amazing how you can read a designer's mind with calipers or a tape measure.  

On old Austin Healeys the entire chassis is laid out in .250" increments.  Similar metric based symmetry can be found on old Italian stuff. 

Chucks holding chucks is too easy for a fast setup. You can spend half an hour making an arbor to hold the inside of a small bore or just grab a smaller chuck in the larger and get stuff done.

One of my techs calls it "Trent's wedding cake"

Kendall Frederick
Kendall Frederick GRM+ Memberand Reader
3/31/24 7:14 p.m.

Love your workmanship on this thing!  Keep it up, and keep sharing.  The 3 jaw/4 jaw wedding cake is awesome.

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