Group Project: Dividing Head - The Build

OK, I finally got caught up and loaded a fresh set of files to the first post.
 
I turned these 2 diameters down to spec & now I am going to cut some threads.

I am still only working on the first spindle. I am not working on any other projects, but I told you guys that I work really long hours at my day job.

38A80827-CDCA-4851-B587-349DD901C66F.jpeg
 
Had more shop time! Unfortunately cut short, as you'll read.

I stopped by ace to get our set screws last night and installed all of them. Then I turned an arbor to start with the OD. I started with the largest bore, and made it tight enough it needed a little tap from a mallet to get on. It also uses the set screw on a flat, plus a clamp off the end.

PXL_20210606_200912283.jpg

I was able to take .100 DOC passes (fortunately, since otherwise removing 2 inches of diameter would take forever...) Without issue.PXL_20210606_201525099.jpg

I finished my roughing on the first one, and it is down to round! So yay for that. Surface finish is kinda bad, but hey, roughing cut.

PXL_20210606_202546133.jpg

It was this point I realized I don't have a 3-4" micrometer! I could use my Fowler 12" calipers but my confidence in them is sorta "meh" (jaws on my 6" B&S aren't long enough to go in straight).

Fortunately I had ordered most of a B&S micrometer set NOS which is shipping Monday anyway! So, just looks like this project is back-burnered until that shows up.
 
Flyinfool said:
Might as well, they are usually pretty cheap at the hardware store.
Click to expand...
Likewise for the base, I'm going to pick up the screws, and use some pins I have.

In my case, I have to have the Auxiliary Base indicated and anchored before I bore for the trunnion. The order of operations will be:

1 - complete the bottom features of the Main Base
2 - flip it on its side, and match drill the Auxiliary and Main together for the screws.
3 - Open up the holes on the Auxiliary, bolt it together, then drill and set the pins.

Once I've set the pin, each Main/Auxiliary Base will be a matched set.
 
erikmannie said:
I am still only working on the first spindle. I am not working on any other projects, but I told you guys that I work really long hours at my day job.
Click to expand...

Relax.

Given current progress, I'm going to be the long pole in this project. I just about have the "boring bar" completed. Rusty, 3" dia steel of unknown grade took a whole day to clean up and turn an MT3 taper on one end. . . the second time.
 
Shotgun said:
Relax.

Given current progress, I'm going to be the long pole in this project. I just about have the "boring bar" completed. Rusty, 3" dia steel of unknown grade took a whole day to clean up and turn an MT3 taper on one end. . . the second time.
Click to expand...
Yeah, I figure we'll be deep into summer before getting even the 1st 'test' version done, and probably deep into winter before this project is all said and done.


Shotgun said:
When faced with making square stock round, I'll cut the corners off with the bandsaw to save on chip making and interrupted cutting.
Click to expand...

I only have a vertical bandsaw setup, and it doesn't really have a table on it, so workholding for that becomes a pain :/ My wood bandsaw is in storage, otherwise I probably would have used that.

In the long run, it didn't take too long. It was probably only about 5 mins to turn down what you saw above. The interrupted cut isn't a problem with the tool I'm using (super round nose, HSS, 3/4" tool) on aluminum.
 
For the next revision, put me down for the "lever handle" instead of MMC. I will make these out of stainless and aluminum. Got to get my ball turner set up.
Robert
 
erikmannie said:
I am still only working on the first spindle. I am not working on any other projects, but I told you guys that I work really long hours at my day job.
Click to expand...
I havent even start my parts yet i just have the material cut up. Dont have to rush to much.
 
I think we should be more focused on quality than time!
Still, I can't wait to see the first one assembled. I am going to run into stretches when I can get very little done and then other times of more productivity. I think we will all be like that.
Robert
 
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