Author Topic: Textile Mill Diorama  (Read 112235 times)

Offline J.L.

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Re: Textile Mill Diorama
« Reply #615 on: September 09, 2018, 07:04:03 PM »
Reassuring Bill to have you keeping me in line.

You may be right about the missing casting. If I see the postman with a brown package, I'll take a picture of it and post it.  ;)

The nice thing about making the part from scratch is that there can be a centre! Working with an open cast hole was more difficult for me.

Speaking of which, cutting this hole on the rotary table is going so well that I may just keep opeining it up until it reaches the correct diameter and forget the 4-jaw!! There has to be a recess at the edge for the rim of the eccentric journal, but that's easy to do on this side because everything is set up. The trick will be to turn the part over to cut the recess on the other side. The centering will have gone.

Maybe a jig of some sort on the lathe?

Thoughts?

Offline b.lindsey

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Re: Textile Mill Diorama
« Reply #616 on: September 09, 2018, 07:10:28 PM »
You can still center the part using an indicator on the central bore I would think as long as the rotary table remains centered as well.

Bill

Offline J.L.

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Re: Textile Mill Diorama
« Reply #617 on: September 09, 2018, 08:01:33 PM »
I understand Bill. So you would recommend staying with the rotary table?
John

Offline b.lindsey

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Re: Textile Mill Diorama
« Reply #618 on: September 09, 2018, 08:09:25 PM »
Sure if you are more comfortable with that. Its probably 6 of one, half dozen of another between that and the 4 jaw. Either way you will have to center on the through bore.

Bill

Offline J.L.

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Re: Textile Mill Diorama
« Reply #619 on: September 09, 2018, 10:16:19 PM »
Hi Bill,

Agreed.

The hole is now 1 3/8" in diameter.

To maintain concentricity on the other side, after a 1/16"  recess is cut on this side, I have decided to make a stub mandrel for the strap on the lathe. The thought of trying to use a dial indicator on this small table with four bolts does not thrill me.


Offline pgp001

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Re: Textile Mill Diorama
« Reply #620 on: September 09, 2018, 11:05:34 PM »
I made a simple expanding mandrel to machine the eccentric straps for Agnes.



Phil

Offline J.L.

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Re: Textile Mill Diorama
« Reply #621 on: September 10, 2018, 01:36:05 AM »
Hi Phil,
I don't quite understand what operation this photo is showing. Are you expanding against the inner walls of the strap to machine a recess?
John

Offline pgp001

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Re: Textile Mill Diorama
« Reply #622 on: September 10, 2018, 06:55:46 AM »
Yes John

But I also faced the straps to the correct thickness as well which is what you are seeing in the photo, the next operation was to recess the inner corners.

Phil

Offline J.L.

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Re: Textile Mill Diorama
« Reply #623 on: September 10, 2018, 02:04:54 PM »
Hi Phil.

 I understand.

I used to make homemade expanding collets with drawbars that went back to a hand wheel when I was woodturning.

They really are time savers.

Thanks for sharing.

John

Offline J.L.

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Package
« Reply #624 on: September 10, 2018, 04:03:30 PM »
Bill, you nailed it. Guess what showed up on the doorstep this morning?  :)

Thanks Ben.  :ThumbsUp:

John


Offline J.L.

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Re: Textile Mill Diorama
« Reply #625 on: September 11, 2018, 08:36:32 PM »
Here we go again - in gunmetal.

Offline J.L.

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Re: Textile Mill Diorama
« Reply #626 on: September 12, 2018, 03:34:23 PM »
And here we are at the point where I got into trouble in the first place trying to drill an oil hole at a severe angle directly down from the face of the strap's projecting lug as suggested in the plans.

This time, a threaded #5-40 hole was drilled straight down for an oil cup to meet this perpendicular hole you see drilled into the back of the lug in the first photo. That little tiny little piece of brass sitting out of focus to the left of the strap is the tapered plug used to plug the hole (photo 2).

Thanks again Ben for the replacement gunmetal strap.

John

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Re: Textile Mill Diorama
« Reply #627 on: September 12, 2018, 09:37:49 PM »
At least you ended up with a very nice part that is up to the standard of the rest of the build John  :praise2:

Offline J.L.

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Re: Textile Mill Diorama
« Reply #628 on: September 13, 2018, 10:20:45 PM »
Thank you.

This time I made the sheave in a 3-jaw chuck. No physical offset was required with the chuck to drill the hole.

My 3-jaw is not that true, but that didn't matter here, because I began with a larger round of cast iron. The piece was faced and rimmed on the metal lathe. Then the chuck was removed from the lathe and taken to the table of the mill/drill where the hole was drilled. Then the chuck was brought back to the metal lathe for parting off.


Offline b.lindsey

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Re: Textile Mill Diorama
« Reply #629 on: September 14, 2018, 02:02:11 AM »
Glad the replacement showed up John. Now it will match the rest of the parts.

Bill

 

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