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Thread: Building the 1:8 Scale RML 10 Inch 18 Ton Woolwich Gun Reply to Thread
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  Topic Review (Newest First)
05-18-2020 10:16 PM
seacoastartillery I neglected to include these three VIDEO CLIPS, so here goes: I had trouble with the third one, so probably only two will play.

Mike & Tracy



05-17-2020 02:36 PM
seacoastartillery John S., thank you for those astute comments. You certainly hit the center of the mark with this one, "The precision and attention to detail certainly produces a quality product." That is EXACTLY our modus operendi. Nice of you to notice that! Math was my least favorite subject in high school, but the shame of flunking it turned me around in summer-school. Fortunately for me, I was taught by a math wizard during those very long 8 weeks and I actually liked math after that experience and got an A+ as well for my efforts. He even taught me a little geometry and trig. as well, besides the basic algebra that I flunked. I loved geometry and saw immediately how well trig. could be used to prove the proper integration of geometric shapes. Fortunately Mike knows the math also, but he has a hard time remembering how much deviation in the height of a right triangle per inch per degree. He calls out above the machine noise in the shop as he sets up the next op, how much dev. per inch per degree, Tracy. I answer back immediately, .0175", Mike. And so it goes at Seacoast Artillery as we stay at home and get things done.

Expect another update in about two weeks. Mike should be on the mill by then shaping the O D of the Trunnion Rings and I hope to be strong enough to help him by drilling and boring some of the 40 regular reinforcing rings we must create before going on to further refinement of the Tube.

Mike and Tracy
05-17-2020 01:25 PM
John.S. Fascinating! The precision and attention to detail certainly produces a quality product.

There is a heck of a lot of math involved in making metal chips to reveal the cannon hidden in those huge chunks of metal.

I really appreciate the time and work you spend on documenting the production process, as well as the actual machine time, and the preparation of plans. THANKS!
05-17-2020 01:07 PM
seacoastartillery Best wishes from Colorado, V A Rifleman. There are five large radii to be produced on each one of these cannon, approx. 12 hours of work on each gun. That spredsheet helps us do these accurately, but certainly does not hasten the process!

Tracy & Mike

This photo shows three of these radii and one more lies ahead of the one Mike just finished at the forward edge of the first reinforce where it meets the tapered, end of the Chase.

05-17-2020 09:24 AM
va rifleman T&M. Thanks for the updates. When I looked at the spreadsheet, 90 different settings for just one operation, on one trunnion ring. Like Spuddy said, a lot of work going into these.

Best wishes from VA.
05-17-2020 09:01 AM
seacoastartillery Thanks for your continued support, Spuddy. In about 10 days we will shift to the milling machine to finish these important Trunnion Ring parts. You fellows will see how we cause the rusty surfaces between the trunnion flats to melt away. Mike mentioned the reason for doing so much more on the 16 In. Lathe, the time savings. The lathe is twice as fast as the mill and does not produce needle-sharp shards of steel to be tracked into Mike's house!!

Tracy & Mike

These sharp, steel shards are the bane of our existence in these turbulent times.

05-16-2020 09:07 AM
spuddy Thanks Mike and Tracy for this latest post. A good reminder of how much work goes into each one of these. What a great opportunity you have made for us to own one of your guns!
05-16-2020 03:54 AM
seacoastartillery In preparation for shaping the forward .625" radius, the lathe chuck jaws were changed to the I D configuration as seen here. When the chuck jaw screws are tightened, they exert pressure outward against the Trunnion Ring bore, holding it in place.

The shiny band on the right in this photo is turned next and represents the top of the .625" radius and the width of this large radius.

The spred-sheet shown here provides the amount of movement left and right and also away and toward the operator during this radius cutting op. In this photo, the radius turning op has already started.

In this photo the radius is 3/4 turned and just a little of the shiny cylinder is left which provides material for the remainder of the radius shape.

The fully cut radius is on view here.

In this pic Mike is stoning the radius. For brite or blued finishes we use 320 grit stones, but since these parts will be painted, 180 grit works better as it gives more roughness for the paint to cling to. Even properly cured paint will chip off smoother surfaces like 320 or 400 grit stones provide.

05-15-2020 09:15 PM
seacoastartillery With the protractor base flat pressed against the work piece rimbase flat, the blade is positioned to be indicated by a .0001" test indicator. As the two ends of the blade indicate "zero", the loose work piece is clamped securely in the vise jaws and the future "wing flat" is ready to be machined. These wing flats intersect the rimbase flat at a precise dimension from its centerline with the future rimbase hole and a point tangent to the circle coincident with the top of the forward .625" radius. These dimensions are exactly the same for the other wing flat on that side of the work piece.

The indication of the left end of the protractor blade.

Indication of the right edge of the blade surface which is brought to a parallel condition coincident with the trammed surface of the vise.

The wing flat is almost 100 % machined; when the intersect point is reached, the wing flat will be complete.

05-15-2020 08:27 PM
seacoastartillery I will try to get as many of the recent photos of our progress on this thread as I can today. We are only 3 Trunnion Rings away from completing all the work shown on each of the 10 assys. Remember that one extra is being made for a "Parts Spare" in case we goof up one of the for sale piece-parts. Mike has reluctantly agreed for me two make two more brief videos.

Mike & Tracy

Two weeks ago I was at Good Samaritan and Mike had progressed up to this level of machining. Today we are much further along.

Basically we are making ones on the left here from ones like the one on the right.

Inspection must verify that each rimbase hole flat be the same distance from the core tube I.D. of the Trunnion Ring.

Mounting the magnet which holds the Swiss made, precision protractor on the work piece. This $200.00 instrument in 1978 dollars has NEVER failed to give us an accurate angle down to plus or minus 2 MOA.

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