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Can someone confirm I have a RO transitional slide |
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colreed
Grunt Joined: Feb 15 2016 Location: Hockley, TX Status: Offline Points: 451 |
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Posted: Feb 15 2023 at 5:04pm |
Mine is the one in the middle. I've never seen one like it.
It has a 1/4" (precisely) arm joint AND a semi-circle cut in the back. It doesn't conform to any other slide in the slide chart. Per the data sheet, it would be labled a E269. CCNL 119-3 states: "A transition slide from E169 to E279 exists. it has a 3/16 arm joint and a "squared off round box". In other words, it is a flat box slide with a curved cut remaining on the inside of the arm. This type slide has only been reported with the Rock-Ola name on the inside or outside of the box." Let me know if a different photo angle would help. |
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"Rescuing one animal may not change the world, but for THAT animal, THEIR world is changed forever"
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4627 |
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Hmm, any sign of rework and refinish?
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colreed
Grunt Joined: Feb 15 2016 Location: Hockley, TX Status: Offline Points: 451 |
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I am glad you asked the question, Dan
On closer observation, it appears as if some of the semi-circular feature may have been illed off. See arrows. That being the case, and if true, this was an ordinary type 1 to begin with. Why would anyone do that? Or could Rock-Ola have done this on the line for some reason? The milling mark design appears to match closely other milling marks on the slide. Could the slide have been mis-forged during mfg and this was done to 'clean it up'? So many questions. Thoughts? Regards |
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"Rescuing one animal may not change the world, but for THAT animal, THEIR world is changed forever"
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jackp1028
Hard Corps Joined: Jan 01 2016 Location: Cloudcroft, NM Status: Offline Points: 1273 |
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It looks like someone added the radius to a Type II arm joint like you see on the Type III, reducing the thickness to 1/4". Maybe it's a Type II and a half. Reed, would you post a side view of the arm joint with a scale in the picture to show the 1/4"width of the arm joint.
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JackP
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colreed
Grunt Joined: Feb 15 2016 Location: Hockley, TX Status: Offline Points: 451 |
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sure. Does this one work?
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"Rescuing one animal may not change the world, but for THAT animal, THEIR world is changed forever"
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4627 |
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Ok, had a little time to go over. The reason for the arm joint to go from 3/8 to 3/16 was it was the same forging from 169 to the 279 slides. The bevel was cut with a step as pointed out below. Being the joint was so thin they went to a new forging for a longer joint with more strength. CCNL 119-3 goes on to say the Rockola name on the inside is earlier and outside on the later. The transitional slide had been reported marked inside, presumed earlier, and marked outside presumed later. I have one somewhere which I will pull when I can, but nothing is suspect about yours from what I can see. The 1/4 inch is because they did not machine the step back as far. They evidently found a benefit by putting in the step, which would give an extra 3/16 play for the spring at compression. From a machining perspective, imagine how long the cutter had to be to cut that round section out being it had to clear the arm. With the advent of the new vertical mill the slat cut could be made easier, less horsepower and far less overhang, which could lead to errors due to flex or runout. |
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jackp1028
Hard Corps Joined: Jan 01 2016 Location: Cloudcroft, NM Status: Offline Points: 1273 |
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Thanks for posting the additional picture. It looks like the arm of a Type II was modified to add a radius to the intersection of the arm and inertial block like you see in a Type III. I believe this undocumented change might have been made to eliminate the stress riser in the sharp corner that could lead to breakage. This unfortunately had the effect of reducing the thickness of the arm joint which was corrected in the Type IV where it was increased to 9/16".
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JackP
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GotSnlB28
Hard Corps Joined: Jan 01 2016 Location: WI Status: Offline Points: 892 |
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Here's one that I have with the same characteristics, though it has the early mfg marking inside the box. No evidence that it's been altered, refinished, etc. One interesting thing about this one is the hole for the slide stop. It seems when manufactured the top hole was mistakenly drilled through with the larger diameter hole from the bottom. I have examined the hole and its edges closely and there is no evidence this was done post manufacture.
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colreed
Grunt Joined: Feb 15 2016 Location: Hockley, TX Status: Offline Points: 451 |
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Yep, looks the same except for logo location. Thanks for posting.
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"Rescuing one animal may not change the world, but for THAT animal, THEIR world is changed forever"
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