Help me riddle this. Alignment issues.

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Ignas Kaz
Posts: 45
Joined: Wed Jun 19, 2019
Location: Coalisland
Country: United Kingdom
Nickname: baronpork
Laser Machine Make or Type: Chinese 9060
Laser Power: 80w
Laser Bed Size: 9060
Home Position: TR
RDWorks Version: v8.01.18
Windows Version: 10

Couple of days ago i successfully aligned the mirrors from scratch, or so i thought. Russ's methods were used.

Went to cut something big today (900x600 bed) and noticed bad cuts in one corner.

Recheck:
Mirror 1 to 2 beam is dead center and parallel with Y motion.
Mirror 2 to 3 beam is also dead center and parallel to X motion on far end.
However, if i move Y all the way back my beam is HIGH ? How ?

If i turn mirror down where its high, its going to be low on near end.

Doing my head in.

Y rails not parallel to each other ? Spot on on near end, low on far end ?

Am i making sense ?
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Ignas Kaz
Posts: 45
Joined: Wed Jun 19, 2019
Location: Coalisland
Country: United Kingdom
Nickname: baronpork
Laser Machine Make or Type: Chinese 9060
Laser Power: 80w
Laser Bed Size: 9060
Home Position: TR
RDWorks Version: v8.01.18
Windows Version: 10

Just to clarify, a diagram of my tape pulses:

Image
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Gene Uselman
Posts: 2180
Joined: Thu Jul 07, 2016
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: QC
Laser Power: 130W
Laser Bed Size: 900x1300
Home Position: TR
Control Software: LIGHTBURN
RDWorks Version: RDw .19 & Lightburn
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Ruida Controller: RDC6442
Windows Version: Win 10 Pro
Accessories: I have a combining lenses, pin tables [homebuilt], honeycomb tables , wireless remote, Modifed Ultimate Air Assist, home built non-powered rotary device, PrusaMK4 and Mini Prusa printers.

Is the bed level with the gantry? Set focus on one corner and then test the other corners.
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Tim Mellor
Posts: 560
Joined: Wed May 29, 2019
Location: Shipwreck Coast, Victoria
Country: Australia
Nickname: beanflying
Laser Machine Make or Type: Vollerun WR3020
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Laser Bed Size: 300x200
Home Position: TR
RDWorks Version: n/a
Windows Version: 10
Accessories: Modded and still Modding some more.

The most likely suspect based on your results is the right side Y gantry is low at the back causing the spot to be high. Unless you have some really good straight edges and verniers then you will find it fairly hard to determine if the left side and right sides are level with each other in particular it is difficult because of the other 'junk' in the way.

Depending on how yours is made it should be fairly easy to fix. If it is built like mine as rollers on a bit of Aluminium angle then you may need to slot the rear fixing holes slightly to lift it or there may already be sufficient slop in the holes to tweak the rail up at the back and down at the front. If it is a linear bearing on a rod then use the same sort of approach to raise the rear mounting for the rod.
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Marcus Baker
Posts: 3
Joined: Sun Feb 28, 2021
Location: Middletown, Ohio Butler Co.
Country: United States
Nickname: Marcus
Laser Machine Make or Type: Preenix Red/Black
Laser Power: 100
Laser Bed Size: 28" x 20"
Home Position: TR
Control Software: LIGHTBURN
RDWorks Version: 8.01.40
Ruida Controller: RDC6442
Windows Version: 10 pro

Is your unit level with the floor? The gantry's level could be influenced by the machine's degree of level.
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