[FR] Sizings

[viappidu]

Not a bug, not a feature request anyhow.
I do understand very well it's a work in progress though I cannot understand how you sized/scaled your model.
Is it for shrinkage or any other reason?

In particular, I printed out the "L_SPACER_Bracket_4mm_x1.stl" and they work fine, but now that I am making some mods myself I cannot understand your way.

(Thanks in advance)

[GadgetAngel]

Yes, it was designed with shrinkage in mind.

I took the DIN bracket outline from the Voron Design Team's own Trident's DIN Bracket for the Voron2.4r2 and copied it onto the "L_SPACER_Bracket_4mm_x1.stl".

The mounting holes size I got from looking at other Voron Design Team parts and I know that ABS will shrink and I looked at what bolt and screw the Voron Design Team used for a parts and that told me what size I should make the hole for the screw head and and what size of hole to use for the screw's shaft. I also rely on fusion 360 software for clearance sizes for screws. See below.

In side Fusion 360 when you select "Surface -> Create -> Hole" and when you select "Clearance" for "Hole Tap Type" the fusion 360 SW will display a pop up menu which contains the following items: "Standard", "Fastener Type", "Size", "Fit". I use the Standard "Ansi Metric M Profile" which will take into account shrinkage for ABS parts.

The following is what I use
the values are what Fusion 360 produces for:
Holes: Hole Type: "Counterbore",
Hole Tap Type: "Clearance",
Drill Point: Flat,
Extents: "Distance".

Standard: "Ansi Metric M Profile",
Fastener Type: "Socket Head Cap Screw",
Fit: "Normal"

Size: M3
Bolt Hole: 3.4 mm
Head Diameter: 6.5 mm
Depth of Head: 3.0 mm

M3 Heat Insert [M3 X D5.0 X L4.0]
Hole diameter: 4.8 mm
Depth of hole: 4 mm

Size: M5
Bolt Hole: 5.5 mm
Head Diameter: 10 mm
Depth of Head: 5 mm

Size: M4
head diameter: 8mm
head depth: 4mm
bolt hole diameter: 4.5mm

Size: M2
Bolt Hole: 2.4 mm
Head Diameter: 4.4 mm
Depth of Head: 2.0 mm

M2 self tapping screw (m2x10):

thread hole diam - 1.9mm
head diam - 4.00mm
head depth - 2mmm
bolt hole diam - 2.4mm
depth for bolt hole to thread hole - 2mm this is cone shape
depth of thread hole - 8mm

M2 Heat Insert [M2 X D4.0 X L5.0]
Hole diameter: 3.8 mm
Depth of hole: 5 mm

Size: M2.5
Bolt Hole: 2.9 mm
Head Diameter: 5.5 mm
Depth of Head: 2.5 mm

Torx Rounded Hex Head:
Bolt Hole: 1.9 mm
Head Diameter: 4.0 mm
Depth of Head: 2 mm

Front Bracket for My Litter Box Mod using M2 screws:
Hole depth: 32 mm + 5mm = 37mm
M2 Bolt hole diameter: 2.4mm
for M2 Heat Insert depth: 5 mm
for M2 Heat Insert diameter: 3.80 mm
On DIN mount bracket for Litter Box Mod using M2 screw:
M2 Head Diameter: 4.4 mm
M2 bolt head depth : 2 mm
M2 Bolt Hole diameter: 2.4 mm
Length of M2 bolt Hole: 13mm

Front Bracket for My Litter Box Mod using M3 screws:
Hole depth: 37mm
M3 bolt hole diameter: 3.4 mm
for M3 Heat Insert depth: 4mm
for M3 Heat Insert diameter: 4.8mm
On DIN mount bracket for Litter Box Mod using M3 screw:
M3 Head Diameter: 6.5 mm
M3 bolt head depth : 3.0 mm
M3 Bolt Hole diameter: 3.4 mm
Length of M3 bolt Hole: 13mm

Voron Logo (My Litter Box Mod):
Cut Depth: 0.8
Base Chamfer: Equal distace and angle: 0.8 at 45 degrees

Voron Lettering (My Litter Box Mod):
cut Depth: 0.8
Base Chamfer: Equal distance and angle: 0.2 at 45 degrees
Top letter edges: Fillet: 0.1

There are many sources on how to tap a hole in fusion 360: https://www.seniorcare2share.com/how-to-model-screw-holes-for-3d-printing-supports/

As far as the design of the L bracket DIN support, I stole the hole out line from the Trident's "DIN_frame_mount_x4.stl" part located at https://github.com/VoronDesign/Voron-Trident/blob/main/STLs/ElectronicsBay/DIN_frame_mount_x4.stl

I just imported the model for the Trident into fusion 360 and found the DIN_frame_mount.stl part and then created a sketch of the DIN outline from the original part. Then copied the sketch over to the part I designed. So I am relying on the Voron Design Team for the DIN hole clearances.

Here is a good source of information about heat set inserts at https://hackaday.com/2019/02/28/threading-3d-printed-parts-how-to-use-heat-set-inserts/

Scroll down the page until you see "DESIGNING FOR INSERTS:". He has supplied a couple of references that inform the user on how big the heat-set inserts hole dimensions should be for a particular size heat-set insert

I hope this answers you question.

BTW, I am like you. I am just starting to design parts and I am learning as I go. I hope this helped.