I’ve made sure all vbearings are secure, z belt is tight, tried slowing my feedrate and lowering rpms. I have tried 60 v bit and a 1/8 end mill on this at different depths with same results. It forms a bowlike ridge throught the center of the pockets.
I’m relatively green and could use some advice to fix this, so I dont have to spend so much time hand chiseling pockets. I’m sure some of you more experienced folks might be able to tell just by looking. Thank you in advance.
MDF gets compressed as it is cut — it’s also important that it be well secured.
Best/easiest way to address this sort of thing is to ensure that one leaves a roughing clearance at the bottom of the pocket and takes a light cut as a finishing pass — for example, https://docs.carbide3d.com/support/supportfiles/S3_feeds_250.jpg has one taking a 0.3" depth per pass, so if one had to make an 0.6" deep pocket, rather than use the suggested 0.3" depth of cut and make two passes, one could reduce that to 0.275" which would make two full-depth cuts down to 0.55", then a final cut of 0.05"
Also make sure that your depth setting is consistent between tool changes.
Thanks Will for your response.
Am I understanding that I need to change the number of passes to 3, instead of 1, if I am cutting .06 depth? Also, is there a decent stepover that works for you when using a 60 vbit when using a vcarve option? I’ve been scouring the internet for proven rates, some seem super low as well as the feedrates, with so much conflicting information I find it quite hard to decipher.
This diagram also refers to the 201 which is a 1/4 inch bit. Ive been using 60 vbit and a 1/8 downcut end mill for what i have been doing. I think the information in the diagram might be a tad bit different for a larger type endmill ?
I’m suggesting a basic principle with numbers specific for a particular endmill.
You’ll need to adjust them to match different circumstances.
See https://www.youtube.com/watch?v=S9bceJxpqG0 for concepts on this and see the series #MaterialMonday: #MaterialMonday on YouTube for specifics.
You should test feeds and speeds in a piece of scrap using the technique at: https://precisebits.com/tutorials/calibrating_feeds_n_speeds.htm
Thank you I appreciate it.
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