GCM 12 GDL sliding arm misalignment

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Roofer / Carpenter
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Hi Brad
​Answer to your qustion is "YES" it will reamin fixed until you undo the hex screw and rotate the Bush with tool.
​as you know head assembley only move up and down with the help of the bearing on the shaft which attaches head and robo arm together .
​so does not matter how your arm moves or what ever the heads postion is , once set the postion of the bush will remain fix .
​this is the same concept as you showed in you picture " marked in yellow "
​Anil
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Roofer / Carpenter
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Hi Brad
​Answer to your qustion is "YES" it will reamin fixed until you undo the hex screw and rotate the Bush with tool.
​as you know head assembley only move up and down with the help of the bearing on the shaft which attaches head and robo arm together .
​so does not matter how your arm moves or what ever the heads postion is , once set the postion of the bush will remain fix .
​this is the same concept as you showed in you picture " marked in yellow "
​Anil
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1978
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Other building trade
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Hi Anil,
I'm sorry but I don't see it working as you described. Your bushing does remain fixed to the swing arm, but the swing arm angle changes during the slide which means the offset rotates with it causing the motor angle and tilt to change in both the vertical and horizontal plane as it slides. If you put a vertical mark on your bushing and it remained exactly vertical regardless of the slide position, this would work. But on my saw that vertical mark rotates with the swing arm as it slides and is no longer vertical at the other end of the slide--thereby moving the offset correction into another plane. A workable offset needs to remain in the horizontal plane only throughout the slide (like I marked in yellow). If such a mod were feasible it would correct for the "crabbing" problem. Maybe someone else reading this thread could weigh in since one of us is not seeing this correctly.

All the best,

Brad
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Hello everyone! I've been having all the same issues as you. I've almost given up on the saw, only used it in chop setting for the past few months since I've discovered the misalignment issue. Inspired by Anil's post, I wanted to disassemble the bushing on the right side of the arm at the last pin before the motor mount. I went at it with a single screwdriver, without holding the pin in place on the other side. The entire pin turned in place. I was just about to grab another hex key when I noticed the sawblade was now closer to the insert plate. I kept on turning the pin while making a cut at each end of the cutting capacity, and eventually the two cuts lined up! It might be that the bushing on the right side of te pin is bored a tiny bit off center, thus by rotating it in the casting it moves the alignment of the pin. I haven't taken it apart so I cant say for sure, but whichever pin I rotated, the blade alignment seemed to change. I took pictures of the cuts I made while messing with the setup, and also the position of my last adjustment on the bushing. I'll try and attach them. The rightmost cut of the 3 was my original factory setup.

This post was edited by bence2055 on 02.12.2020, 21:43 o’clock
Reason: Typo

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Furniture manufacture / Furniture industry
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Hello all, I just bought my gcm12GDL this month and I am having the same issues. After reading Bence2055 post I tried the same thing. I am at 4 full turns of the last pin and no alignment change that I can see with the laser as a guide on my cuts. I though I saw it moving at first but it was just the pressure being applied to move the pin. The whole barrel/pin seems to rotate. I definitely expected more from a mitres in this category. I think il be looking at my options for swapping it out for something else even though I've just built an 7m mitres cabinet/Station around the dimensions of this saw ��‍♂️. Just need to find something with a similar slide profile .