Drill holes sets

[Adamwoodward]

hello, i wonder if someone could have a look at this please.
I am trying to drill a series of holes too insert some crochet tools in a display board, they go up in sizes and i am trying to drill an accurate hole for each one.
I have a 1/4" end mill and the smallest is around 5mm and the largest around 10mm.
I have set the circle as half the width for the radius and used a pocket hole toolpath but it keeps on coming out to wide, am i going wrong with the offset?

debs crochet hooks 2.c2d (64 KB)

[mhotchin (Michael Hotchin)]

First off, a 1/4" mill is 6.35mm You can’t make a hole smaller than that.

Secondly, you say you have a 1/4" mill, but your pockets toolpaths are using a 1/8" mill.

[Adamwoodward]

Hello Michael.
Sorry, i meant 1/8" is what i am using

[WillAdams (William Adams (Carbide 3D))]

What material are you cutting?

Why are you using a #102 DEFAULT tool?

You are cutting to a depth of almost 3 times the diameter of the tool? Where possible avoid slotting and add geometry and cut as a pocket

Making vacuum hose adapters

While cutting up vacuum extension wands for this is expedient, it’s a bit problematic given that Shop Vac recently filed for bankruptcy, was bought at the last minute, and production hasn’t caught up. I need a receptacle for the Sweepy 2.0 dust fitting — one option would be to purchase one from Woodcraft, but Carbide 3D sells blocks of HDPE: which looks to be just barely big enough for things to fit. Measuring the hose fitting I get a diameter of ~63.5mm — offsetting that twice we arrive at…

and/or

Adding geometry to cut as a pocket with a finishing pass

One technique which is often suggested to avoid slotting is to add geometry around a part which one wishes to cut out and cut as a pocket down to tab depth — here’s one technique for that. In this case, the project is a bevel gauge which will be cut out of 0.0625" (~1.5mm) thick aluminum: [bevelgauge] Due to the narrowness of the angles, an 0.03125" endmill has to be used, so after importing and scaling the file (we will be cutting out one which is 3") we select the perimeter and offset it tw…

and consider leaving a roughing clearance and taking a finishing pass.

Best Bit for full cut through

One which has a cutting flute length equal to or greater than the thickness of the stock — pretty much any tool should work. Big thing is the toolpaths — if cutting out, rather than just cutting a slot: [image] Offset to the outside by endmill diameter plus 10% or so: [image] [image] [image] Then cut as a pocket: [image] down to tab height or the penultimate pass: [image] then move the contour down to below the pocket and start cutting at the bottom of the pocket: [image] and…

[Adamwoodward]

Hello Will.
I am only intending to cut these as a hole so the tools can stand up in them, i reckon around 8mm deep into 18mm timber would be ok.
The cutter i am using is the 1/8" one which has a diameter of 4.7mm ish.
The first hole i am trying to cut is around 5mm, so a bit bigger i thought would be ok with the 1/8" end mill.
I do another one for some items we make where the hole needs to be 12mm, i set this as a pocket with a raduis of 6mm, again to a depth of 8mm and it does this fine so i just transfered the diameter of the hole for this job in the same way

[WillAdams (William Adams (Carbide 3D))]

A 1/8" tool should have a diameter of 3.175mm

You need to enter the settings for your tool accurately (and be careful when measuring to not damage the flutes):

Cutters & collets | Shapeoko CNC A to Z

then, you need to use feeds and speeds suited for the tool and material combination:

Feeds & speeds | Shapeoko CNC A to Z

and toolpaths:

Toolpaths | Shapeoko CNC A to Z

[Tod1d (Tod (with 1 'd'))]

1/8" = 3.175mm

I would use a hole milling strategy.
Set the depth of cut on the tool to something large, I used 1"
Set the plunge feedrate the same as the cut feedrate
Use a contour, Inside, Climb cut toolpath, with ramping at about 3°
For the holes that are larger than 2x the tool, add an additional pilot hole in the center & cut those first.

The path will spiral / helical into the hole & make a flat pass at the bottom.

debs crochet hooks 3.c2d (60 KB)