48.01 Carrier block
Posted 04 December 2013 - 03:50 PM
A learning part will be made first in 6061 aluminum. Dimensions 3" x 3.125" (complete material list can be found here.)
Cutting tools are carbide, brushed on lubrication will be used on all cuts.
The learning part will be machined as one piece. I understand two piece may be the best way to go.
After studying the prints for some time a distinct lack of talent was discovered. All the dimensions have been sorted save one. Looking at 48.01 the od on the hex does not seem to be specified. I located the od to flat dimension and the base circle to peak dimension but cannot determine the base circle (dotted circle) dimension.
Lathe order of operations.
Mount the material in the chuck with about 1.5 inches exposed (should it be turned between centers?)
Bore 0.625 hole through piece
Bore 1.000 x 0.125
Turn od to unknown dimension (see above)
Shoulder cut to 1.250
Slot (using cut off tool) 0.090 to depth of 0.150
Reverse piece in chuck
Face to overall length of 3.000
Reduce od to 2.750
Reduce step od to 2.500
Place material in dividing head chuck (hex part facing up)
Use center drill to mark 10 holes on 2.000 diameter
Center drill 0.187 dowel pin hole 0.625 from center inline with barrel hole (press fit)
Bore 10 - 0.275 through holes on 2.000 diameter
Ream to 0.281 (9/32?)
Mill 10 flats on to a depth of 0.375 below od. Top of flat should be even with center of hole.
Reverse material in chuck
Index to dividing head
Bore holes 0.415 to 1.750
Ream to 0.420
That completes this piece. Please suggest a better (one piece) way to proceed. Making the assembly in two parts would save boring and reaming a blind hole and a good bit of material.
Posted 05 December 2013 - 03:12 AM
Just finished my barrel assemblies today. Good luck with your build.
Posted 05 December 2013 - 06:17 PM
I found this much easier and more accurate than attempting to keep a drilled and reamed hole straight and on size through the stacked up plates.
Posted 05 December 2013 - 07:19 PM
See, I can change my alleged mind. I even manage to listen to sage advice now and then.
Working on the new order of operations.
I really do appreciate all the advice, thanks!
Posted 06 December 2013 - 01:34 PM
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