select
navigate
switch tabs
Esc close

Feasibility of sharp internal corners in CNC-machined

0
J
2

I’m about to place a CNC machining order for a small ABS housing with some detailed features, but I’m unsure if the internal recess can be manufactured as designed. The model includes sharp internal edges and small chamfered corners. The outer chamfer is around 0.2 mm at 45°, and internal corners are close to 90° with minimal fillets. Has anyone machined similar features in ABS before? I’d like to avoid redesigning if this is doable within typical machining constraints.

    • J

      I’m about to place a CNC machining order for a small ABS housing with some detailed features, but I’m unsure if the internal recess can be manufactured as designed. The model includes sharp internal edges and small chamfered corners. The outer chamfer is around 0.2 mm at 45°, and internal corners are close to 90° with minimal fillets. Has anyone machined similar features in ABS before? I’d like to avoid redesigning if this is doable within typical machining constraints.

      0
    • M

      Yes, I’ve machined similar parts in ABS before. I recommend reconsidering some of your internal geometry. ABS is easy, it’s got low cutting resistance and it holds detail well, but sharp internal corners are essentially impossible. You can’t get a perfectly sharp 90° internal corner with a standard tool because of the cutter’s corner radius. Even with 0.5 mm diameter cutters, there’s still going to be rounding in the corner.

      Chamfers as small as 0.2 mm can be very challenging. The variation in a typical chamfer tends to be more than 0.2 mm! If the tooling isn’t dialed in precisely, small chamfers can either be skipped or deliver inconsistent finishes, especially in a softer material like ABS. You’re more likely to get better results with a larger chamfer, or a fillet that shows the variation less.

      0
      Reply
    • e

      If your design can tolerate slight fillets in those internal corners – say 0.5 mm radius – you’ll improve machinability and process times. That said, a good CNC shop can advise based on their tooling and precision level. I’d suggest sending them the STEP file and asking for feedback before locking in the order. It’s better to tweak the design slightly now than to get a part back that doesn’t meet expectations.

      0
      Reply
Feasibility of sharp internal corners in CNC-machined
Your information:




Suggested Topics

Topic
Replies
Views
Activity
Choosing the Right Material for Injection Molding – What’s Your Go-To?
Hey everyone! I’m working on a few small-batch parts and weighing my options when it comes to materials for injection molding. I've used ABS and polypropylene in the past, but I'm curious—what materials do... read more
0
25
Jul 18
Gluing ASA parts for outdoor use
Hi there, I’m prototyping an outdoor enclosure for a small LiDAR unit, printing it in ASA due to its UV resistance and decent mechanical strength. I’d like to bond a front cover to the... read more
N
M
D
E
3
72
Jul 03
Material recommendation for axial guide replacement
Hello everyone, I'm replacing a broken axial guide component from a spindle assembly—this part sits on the Z-axis and connects the drill to the mounted machine frame. It failed during a milling op, likely... read more
B
m
J
2
149
Jun 26
hidrogene turbine
I want you to make me two hulls of about 20 cm radius and a 16 cm rotor for a turbine that will burn hydrogen with oxygen.
1
117
Jun 13
Best way to mount NEMA 17 motor on 2 mm aluminum base?
I'm working on a compact test rig where I need to mount a NEMA 17 stepper motor onto a 2 mm thick aluminum sheet (EN AW-5754). The base has to stay as light as possible,... read more
T
G
r
4
277
Jun 26