Asking Collective Wisdon Gnawing Plastic Reinforcing Ridges

$20 at HF under $30 on Amazon, $24 at walmart

oscilating multi tool

tool with plunge blade, make quick work of that plastic

Flush cut wire cutters, followed by the dremel with rotary burrs to flatten them out.





Done it, might not even need the rotary burr file.

Plastic? Ratz. Burr is a quarter -- Dremel is eighth inch shaft























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Mex,

If you plan to run that tool in your good drillmotor, be ready to kiss it good bye....

No drillmotor has bearings for that kind of side load.
If you can use the flexshaft tool to do it, that probably has the bearings for it.

Me? I would start with a sharp wood chisel and a hammer until it was mostly gone. That way I could cut nearly flush to the bottom.

Matt

Boing! Light Bulb! I was using the wrong cognitive!


RASP!



It's for plastic

Problem solved. Thanks for the helping hand!

One of these in your Dremel will cut those ribs with minimal issues. Cuts 90 degrees to the axis of the Dremel so makes it simple to get the tool into the box.

Ryobi-18-Volt-ONE-JobPlus-Base-with-Multi-tool-Attachment-Tool-Only (oscillating saw tool head)

Uses flat ascillating saw blades that can cut flat against objects. Might be able to set the flat blade against the desired surface to cut the ribs flush with that surface.

This will give a general idea. The reinforcing ribs are deeper inside

This is going to be a 135 amp fully adjustable battery charger





Different box but this is the only example of what's inside my box.

A frustrating problem for me. Lose the ribs! :)

Several options come to mind, if I'm understanding properly, depending on one's specific needs (shapes to be cut and the like). I'm not sure I have a complete view of what you're trying to accomplish, though.

If the goal is not through holes but just removing reinforcement material on the inside without going through the outside skin, a router with the depth adjusted appropriately is about the best option I can think of. The base plate is the key here to controlling things. Just manipulating a router bit completely freehand would be very hard to control (as it sound like you have already discovered). The Dremel router attachment would probably do okay here.

For largish round through holes, a hole saw in a drill would probably be tough to beat. For smaller ones, obviously one uses a plain old drill bit.

For mediumish to reasonably large through holes with straight line sides, an oscillating multi-tool would be good. These are remarkably handy, not the fastest cutters in the world, and can do some cuts that are pretty much impossible to make otherwise.

A jigsaw/saber saw would also likely do the trick for through holes, though may tend to leave somewhat rough edges.

Do you have cut-off wheel attachment for your Dremel? Just like a miniature version of what you would find on a 4 1/2" grinder except only about 1" in diameter and maybe 1/32" thick.