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D1-4 Spider

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Bamban

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#1
Is anyone interested in making a D1-4 spider for a fee?

Material, any steel

Dimensions:
Diameter - 8 inches
Thickness - 3 inches
Spider bore - 2.5 inches
Spider screws holes - 3/8 x 24

I stated 8 inch diameter just for convenience, more room tp grab it and turn when dialing a barrel.
 
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magu

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#2
Another option would be to just turn a round spider and mount it in a 3 or four jaw chuck.
 
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#3
Bambam,

I have a piece of ductile iron here I roughed out for a project that never happen. The piece is about 8" OD x 2-1/2" ID x around 3-3-1/2" lg. If interested in the material PM me.

Ken
 

Bamban

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#4
Another option would be to just turn a round spider and mount it in a 3 or four jaw chuck.

Magu,

Thank you.

Never thought about mounting a spider in a 4J, however I am trying to minimize the spindle overall length.
 
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Bamban

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#5
Bambam,

I have a piece of ductile iron here I roughed out for a project that never happen. The piece is about 8" OD x 2-1/2" ID x around 3-3-1/2" lg. If interested in the material PM me.

Ken
Ken,

Thank you for the offer. PM on the way.


Nez
 

Big Bore Builder

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#6
I made this one last week using a D1-4 backing plate;

1514256964784.png


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Setscrews are 1/2"-20. The short ones are for locking down the longer ones after the barrel is dialed in. The rectangular pads swivel on the tips of the longer setscrews. I wrap a 1/16" thick copper strip around the barrel to prevent marring.

Takes up far less room than the 4 jaw chuck.
 

petertha

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#7
That is really cool. Was the backstop lock down set screw idea an extra precaution or it actually happens that they can loosen?
I guess a typical chuck screw/jaw thread must be a different kind thread engagement principle to axial screws like this application because we don't usually consider loosening much?

Was the plate cast iron or a machineable steel?
 

Big Bore Builder

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#8
Extra Precaution.

The back plate is from Grizzly. Saves a lot of machining time, plus it came with the cam lock pins. Cam lock pins are just about impossible to source, if you find them they are expensive. All I had to do was set it up in the dividing head and drill&tap the 4 holes. And it is large enough to obtain a good hand grip when dialing in. Material is high grade cast iron.

The long setscrews with the swivels were salvaged from a 220 volt service panel, they were in the clamps that the big entrance wire is held.

1514304123762.png


1514304172303.png
 

Bamban

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#9
BBB,

How far off the edge are the spider screws? How close did you get to the cam lock stud screw holes when you drilled the spider screws? Seems a challenge to drill/tap holes that are 90 degrees apart right next to tapped holes that are 120 degrees apart.
 
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