Anyone else have holding tabs that look like this?
Here are my settings in Estlcam
I use a flush trim bit on the router table to get the little nub off. No problem.
What I don’t like is the line that goes up the whole way. It’s like ~0.5-1mm deep. Not too big of a deal, as it sands off.
Its like the tool gets pulled towards the wood there when it lifts up to leave the tab? Can I improve this with a setting?
Is it deeper above the tab?
Yeah, the tab is 6mm. The workpiece is 18mm thick. Maybe this is a good thing to change. I only need ~3mm for the bearing of my flush bit. I was trying to make the tabs as short as possible so I only had a z movement for the last two passes (ex 3mm DOC). Maybe I should do it the other way around 18mm-3mm and leave it as a 15mm tab
Yes, doing a full depth finishing pass. 0.20mm allowance (1/8" endmill)
Hmm, maybe but I would expect my 5% round nose bit stepover to really show that and it is very consistent.
It did it with full depth tabs too. I’ll have to try and find a picture or run a test.
What depth of cut are you using in the picture? I don’t think you would see a difference in XY stepover. But if you took that cut in 5 passes, one of the sides would have steps going down.
Machine/bit flex, dull tool, deep cuts, fast X/Y, slow Z and possibly acceleration. The tool only moving in Z to plunge/retract releases the tension on the side of the tool and allows it to dig into the sidewall. I imagine there is also a divot at the path start/end point. Ramping the plunge helps to minimize the effect. Full tabs typically makes it worse, more pauses and Z only moves.
The picture shows the part function with a 1/8" endmill, 3mm DOC.
The round end nose bit comment was when I was doing the pocket on the inside (not shown). I was thinking if my Z wasn’t perpendicular, I would have higher ridges on one side. Sorry if my comment was confusing
I’m at the default 90*. I’ll try that next. What do you think, like 45*?
I use 30, but I think halving your DOC would be a better start.
Yup. Tried many things, but stiil had the marks. What i do now is leave less than .5mm on the bottom of piece with no tabs. Easily separate it with a razor knife then lightly sand the whole outer edge for a clean edge.
My two cents from what works for me.
Painters tape and CA glue and don’t use a holding tab at all. Or if I’m doing something bit I’ll shut off dust collection on the last pass. The dust in the grove will hold it from moving. Mostly I screw down where I can to not have to worry about it. I hate dealing with holding tabs. The flush trim bit on the router is a good idea though I’ll have to remember that next time
