Does this indicate twist in my gantry, and if so what is the best way to address it? As the router goes from xmin to xmax, the sawtooth pattern becomes more pronounced, from barely visible at xmin to kinda crappy at xmax (it does cut deeper on xMax so perhaps that’s a factor too) [PXL_20250104_18…

Okay I’ll run another pass with a different stepover and see where things stand, I do see minor tram issues in the Y direction, I was just puzzled by the increase over X, but yeah perhaps it was just depth of cut on that first run.

Your tramming issue is the same allthe way across, its just more apparent because of the depth.

Think I’ve found my issue [PXL_20250104_205924788] [PXL_20250104_205942931]

So at xMin the bit is perpendicular to the table, at xMax not so much. I was able to reduce the error to about .5 degrees by loosening the three screws and twisting but having a hard time completely zero-ing it out. Is it worth disassembling such that I can potentially rotate the plate a bit after …

[image] Damian Penney: So at xMin the bit is perpendicular to the table, at xMax not so much. You don’t want to check if the bit is perpendicular to the table, you need to verify the router/bit is perpendicular to gantry/plane of motion. Once that is fixed, surfacing will fix the table Ther…

Discussion starts here: [image] Pocket with a T-slot bit Fusion360 I’m new here and haven’t actually built mine yet…so bear with me… Is getting the spindle perpendicular with the work surface what’s important first? Or is getting it perpendicular with the X gantry what m…

[image] Mike M: You don’t want to check if the bit is perpendicular to the table, you need to verify the router/bit is perpendicular to gantry/plane of motion. Perhaps but as you can see from the pics the spindle angle changes from xMin to xMax so there is definitely twist in the assembly som…

[image] Damian Penney: Perhaps but as you can see from the pics the spindle angle changes from xMin to xMax so there is definitely twist in the assembly somewhere That may be the case, I didn’t really read everything closely. Just wanting to point out that you want to make sure the router is…

If it’s perpendicular to the rail on one side, but not the other, it definitely sounds like an issue to me

Only other thing I can think of, would be to check and make sure the rails don’t extend outside of the braces near the XZ plates. Rails should have been cut with some room to spare and inset from the end by 1mm or 2. We have seen that cause some funky behavior in the past. There was another thread…

Help diagnosing tramming/twist issue

LowRider CNC Advice

Michael_Melancon (Mike M) January 4, 2025, 10:40pm 10

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