PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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So here we have installed the 90 degree head on the Bridgeport mill. With this we will horizontally drill the holes laying perpendicular to the face of the Collimation Plate. We are squaring the plate mounted on the rotary table with the help of a dial indicator mounted to the mills quill.
We have 2 sets of 3 holes to be drilled. The Rocker Arm axle holes in the 3 flat sides of the plate and then the Collimation Swivel holes in the tapered end of the late.
Note the use of sheet metal spacers to prevent the maring of the ID of the large center hole by the 3 jaw check.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 12:56 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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In this shot, we have already spot drilled the exterior of the face of the plate and are now through drilling the Rocker Axle shaft hole with a 1/4" drill. This then gets drilled just under 5/16" and then reamed to 0.3125" or right on 5/16 for a snug fit of the shaft.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 04:56 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Shot of reaming the Rocker Axle shaft hole to 0.3125"
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 04:58 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Next, the Collimation Swivel holes in the tapered ends of the plate need setup and drilling...
First spot drilling as the face is not perpendicular.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 05:10 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Then drilling the Collimation Swivel hole to just below reaming size.
The Bridgeport is nice for this type of work as the head can be moved in and out on the slide or rotated to be able to reach anything on the milling table...in this case, I retracted the head slide almost all of the way in toward the column.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 05:00 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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So we are through with the 90 degree head, it gets removed and we set up to drill and tap the set screw holes for the Rocker Axles shafts.
Spot drilling in photo.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 01:03 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Finally Tapping the set screw for a 10-32
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 01:05 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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So here is the Rocker itself. I've already milled the heigth to 0.800" , drilled the 2 holes for the radiused corners, face milled the knotches in both ends, drilled the holes in the knotches for the ball end adjusters, and here we are spot drilling the hole for the axle shaft...
It then gets drilled to 0.4040 and reamed to 0.4062.
Later, will will turn a bronze bushing to press fit to the 0.4062 with an ID of 0.3125 for the 5/16" 303 SS shaft to go through holding the Rocker in place.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 01:08 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Here is a pic of the Back Plate as it was recieved with one of the 3 cooling fans sitting in the releaved space.
The ruler laying across the plate is 24 inches.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 05:01 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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A close up of the fan and lightening holes.
You can see the radius in the bottom of the holes that was created by doing the finish pass with a ball nose end mill.
Nothing to creat any stress risers.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 05:03 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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And finally the rings that will be used for the middle and upper rings. Two will be fastened together to creat the mid ring.
This was done to be able to seperate the upper section from the lower containing the primary mirror. We did this, to facilitate being able to more safely place and remove the primary mirror.
Only one ring will be used as the upper ring.
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 05:04 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Lastly a close up of the ring.
It's 3/8" thick, 26.5" in diameter and 2 3/8" wide.
Over the weekend, I'll be working on tapping the holes in the back plate and rings for a trial assemble next week.
Then, finishing up the parts to assemble the collimation plate to the back plate for final measurments...before cutting the carbon fiber tubes 
Hope you are enjoying the build and hope I've not put up TOO many pics 
Regards,
Preston
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 05:06 PM)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Ok, so I missed the one with the rockers in the collimation plate and one sitting on the plate...
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A few I enjoy,
and a few more in the works ;<)
Edited by PrestonE (06/14/08 05:08 PM)
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Michael Miles
professor emeritus
Reged: 02/11/05
Posts: 603
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Quote:
...Hope you are enjoying the build and hope I've not put up TOO many pics ...
No problemo - they look great, and it looks like you're having fun.
However, I will not be posting any more pictures of my machining out of envy for your equipment and elegant design.
Michael
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LXD-75 w/
Stellarvue 102ED
Hardin 10" Newt
Antares 8" Newt
Meade AR-5
Meade N-6
Celestron 102mm refractor
Canon 300D, Meade DSI guiding
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Micheal, Please do post pics of you machining and design for all to learn...
My father many years ago, suggested to me that I buy tools...the best that I could afford...for they would serve me for a life time...
And, thus I have been buying tools for most of my life or about 45 years...and I'm now 52
No formal training in machining...just the desire to learn and make things...
The next build will Hopefully be using my CNC mill and lathe...but I truely appreciate the manual mill and lathes I currently am able to use...
Best Regards,
Preston
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A few I enjoy,
and a few more in the works ;<)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Ok we are back on track...and I'll be posting tomorrow afternoon the work done tomorrow...
Tapping the 10-32 holes in the back plate...
and the I think 24-3/8" for the squaring ring and colimation push pins...
And looking forward to trial assembly of the truss tubes...
Best Regards,
Preston
--------------------
A few I enjoy,
and a few more in the works ;<)
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Sky Captain
Scope Builder
Reged: 11/07/04
Posts: 5742
Loc: Seattle Washington
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Looks like it all arrived in good shape.  Nice picts. Preston...keep'em coming!
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Equipment Overload!
Kerry.
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Thanks Kerry, Here's todays action...
Starting by chanfering the holes that will be tapped to 10-32 to hold the Capture Blocks in place on the back plate.
12 holes total... and we are using the rotary table on the mill as a convient vise
--------------------
A few I enjoy,
and a few more in the works ;<)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Next we are hand tapping the 12 10-32 holes...
Yes I have an automatic tapping head, but it would take FAR longer to get it aligned that it's worth at this point.
Note the aluminum block with a hole just larger than the thread size to act as a guide to keep the tap perpendicular to the surface...also the blue masking tape keeps the guide from scratching the surface.
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A few I enjoy,
and a few more in the works ;<)
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PrestonE
scholastic sledgehammer
Reged: 04/29/05
Posts: 817
Loc: Houston,Texas
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Removing the guide block to through tap the hole the entire 3/4" thickness of the back plate
--------------------
A few I enjoy,
and a few more in the works ;<)
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