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CNC improving edge cut quality when using compression bits

10/20/21       
Javitojavito Member

Hi, I use 1/2 inch compression bits for cutting 3/4 inch ply, mdf and ply with melamine sheets. Cut quality is great on top and bottom edges but sometimes it shows some fibers on ply, striped patters (more noticeable on MDF and loosely matching the compression spiral drawing) and diagonal marks on the edge itself (from the lead ins and outs). I was wondering if using a straight cutter after would improve the overall edge finish. I am not too concern on adding additional time if this saves from doing additional manual post processing after. Many thanks!

10/20/21       #2: CNC improving edge cut quality when ...
Mike

What is your chip load? If unsure, post your feed, speed and number of flutes on your tool.

10/20/21       #3: CNC improving edge cut quality when ...
Javitojavito Member

2 flutes compression bit, cut feed 200ipm and spindle speed of 20000rpm

10/20/21       #4: CNC improving edge cut quality when ...
Stephen Williams  Member

Website: http://www.partscuttercnc.com

Crazy slow

2 x .021 x 20000 = 840ipm

Get an Onsrud book

If you are getting milling marks its probably from movement, what kind of vacuum do you have?

10/20/21       #5: CNC improving edge cut quality when ...
Javitojavito Member

Thanks will do. Vacuum is a becker pump 5kw, seems ok for cabinet parts but drawer parts need onion skinning and/or tabs when pieces are long and very thin. Could be the slow feed rate? when using my festool hand router with a straight bit I got very smooth finish at lower feed rates. Many thanks again!

10/20/21       #6: CNC improving edge cut quality when ...
Stephen Williams  Member

Website: http://www.partscuttercnc.com

You are killing your bits at such a slow speed.

I would say you need more vacuum

10/20/21       #7: CNC improving edge cut quality when ...
Mike

Yes, at that feedrate your chipload is 0.005 which is way to small. Can your machine get to around 800ipm? if not, slow your rpms down and up your feedrate. My typical chipload is 0.019 for a variety of materials used in cabinet making.
Chipload = Feedrate / (RPM * # of Cutting Edges)

11/2/21       #9: CNC improving edge cut quality when ...
AcctekChina Member

Website: https://www.acctekgroup.com/CNCRouter/

Generally, for holes with a diameter of less than 6mm, if the accuracy is not high, use hand pliers to clamp the workpiece for drilling; for holes of 6 to 10mm, if the workpiece is regular and even, flat-nose pliers can be used to hold the workpiece, but the workpiece should be clamped The surface is perpendicular to the spindle of the drilling machine. When drilling a hole with a larger diameter, the flat-nose pliers must be fixed with a bolt pressing plate; for larger workpieces with a hole diameter of 10mm or more, the pressing plate clamping method is used to drill the hole.


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