Group Project: Dividing Head - Organization and Design

[Shotgun]

Looked at the cost of delrin bushings on McMaster-Carr and choked.

But, you can get a foot of aluminum of the correct ID/OD for less than $6

6061T6 Round Aluminum Tubing | Aircraft Spruce

6061T6 Round Aluminum Tubing 6061T6 Round Aluminum Tubing

www.aircraftspruce.com

 

[Shotgun]

Was the idea for all of us to send all our parts to 1 person for assembly/QC? If that is the case, we are probably better off just having the parts ordered as a group.

I'd be fine putting a few bucks in to "group buy" that hardware.

Maybe not assembly. More for distribution. But, yeah, that was my thinking. The logistics just work better.

 

[rwm]

I would be afraid the aluminum would gall. Can we find cheaper oilite or delrin somewhere?
I was planning on making the shift lever as part of the gearshift assembly but I will defer this if someone else wants it.
Robert

Edit: I see acetal bar for $10 per foot for 1-3/4" OD. Could make bushings from that.
R

 

[ErichKeane]

I would be afraid the aluminum would gall. Can we find cheaper oilite or delrin somewhere?
I was planning on making the shift lever as part of the gearshift assembly but I will defer this if someone else wants it.
Robert

Edit: I see acetal bar for $10 per foot for 1-3/4" OD. Could make bushings from that.
R

Cheaper than I found Amazon was $30/ft or so. But $20 for 2 feet (enough for the 16 we need) seems like a heck of a deal over the $6 each!

 

[ttabbal]

Amazon.com: Acetal Copolymer Round Rod, Opaque Black, Standard Tolerance, 2" Diameter, 12" Length : Musical Instruments

Buy Acetal Copolymer Round Rod, Opaque Black, Standard Tolerance, 2" Diameter, 12" Length: Multipurpose - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

Could easily get 10 from a foot, 1" length bushings.

You guys beat me to it. I also went to 2", but I do think 1.75 would get the job done, with the bore in the trunnion adjusted.

 

[ErichKeane]

Amazon.com: Acetal Copolymer Round Rod, Opaque Black, Standard Tolerance, 2" Diameter, 12" Length : Musical Instruments

Buy Acetal Copolymer Round Rod, Opaque Black, Standard Tolerance, 2" Diameter, 12" Length: Multipurpose - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

Could easily get 10 from a foot, 1" length bushings.

You guys beat me to it. I also went to 2", but I do think 1.75 would get the job done, with the bore in the trunnion adjusted.

I thought the originals were 1.6875 or something odd like that? I searched 1.75 to have room to turn the od

 

[ttabbal]

I thought the originals were 1.6875 or something odd like that? I searched 1.75 to have room to turn the od

1.6895. I must have been thinking about something else.

 

[rwm]

Here you go if someone knows how to turn thin bushing in acetal?

Delrin - Acetal Plastic Rod 2" Diameter x 12" Length – Black | eBay

Hard water does not harm the material, unlike many other materials, which may erode in acidic water. On the other hand, fixtures hold a workpiece steady in a fixed position, orientation, or location rather than guiding a cutting tool.

www.ebay.com

R

 

[Ianagos]

How about uhmw?

I have a bunch of 2” diameter I can cut all the bushings pretty easy on the cnc?

 

[rwm]

These bronze bushing would yield all bushings for us:

Brass Bushing 1-1/2" Bore, 2" OD, 3-1/4" Length Lot of 4 | eBay

, Oil Threaded--New Surplus--Not In Box--4/21JS.

www.ebay.com

Brass Bushing 2" OD 1 1/2" Bore Assorted Lot of 5 | eBay

1-1/2" Bore, 2" OD--3 Bushings are 3" Long, the other 2 are 4" Long--New Surplus--Not In Box--4/21JS.

www.ebay.com

This seller has a lot of 1-1/2 ID bushings. It would not be hard to cut these into 16 individual bushings as long as the ID is not oversize.
R