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betti dfm check

Check a part for a manufacturing process, named by -process. A STEP, IGES, JT or Parasolid part works for any process; a closed mesh for moulding, casting and printing.

dfm module Granted on request: see access and licensing.

Usage

Shell

betti dfm check [flags] in

Machining: holes too deep, flat-bottomed or with an odd drill point, entering through slanted faces, too close together or to the outside, a pocket or the floor; inside fillets too small, too many fillet radii, faces no cutter reaches, deep narrow pockets.

Sheet metal: the sheet's thickness and bends found, then bends too tight for the material; holes, slots, notches and webs too narrow; corners too sharp; holes and slots too near a bend; missing reliefs, short flanges; the flat pattern.

Injection moulding, die and sand casting: the nominal wall, then walls too thin or thick for the material, thick sections, too little draft along the pull, undercuts, sharp inside corners, small inside fillets.

3D printing (am-fdm, am-sla, am-sls, am-lpbf): the build direction, then thin walls, overhangs needing support, narrow gaps, small holes and pins, voids trapping resin or powder.

In a script this is dfm.check(…), its flags as keywords; for coding agents, the tool dfm_check.

Examples

Shell

betti dfm check -process machining part.step
betti dfm check -process machining -depth-ratio 6 -wall 2 part.step
betti dfm check -process machining -json part.step > findings.json
betti dfm check -process sheet-metal -material stainless bracket.step
betti dfm check -process injection-moulding -material nylon -pull z part.step
betti dfm check -process am-fdm -up z part.step
betti dfm check -process injection-moulding housing.stl
betti dfm check -process am-sla -json part.obj > findings.json
betti dfm check -process injection-moulding -gates 2 -fill fill.vtu housing.stl

Flags

Flag	Takes	Default	Meaning
`-bend-hole`	number	`2`	sheet metal: the least distance from where a bend begins to a hole, in thicknesses
`-bend-slot`	number	`4`	sheet metal: the least distance from where a bend begins to a slot along it, in thicknesses
`-depth-ratio`	number	`10`	machining: the most a hole's depth may be, in diameters
`-ductility`	number	none	sheet metal: the material's greatest tensile strain, from 0 to 1, in place of `-material`'s
`-face-angle`	number	`1`	machining: the most, in degrees, the face a hole enters or leaves by may turn from square to it
`-feature`	number	`2`	sheet metal: the least width of a hole, slot, notch or web, and radius of a corner, in thicknesses
`-fill`	text	none	injection moulding: estimate the fill (from `-gate`, `-gates`, or one gate placed) and write it to this .vtu file
`-flat`	text	none	sheet metal: write the flat pattern (the blank's outline and holes) to this .dxf file
`-gap`	number	none	printing: the least gap across between the part's faces, in mm (0: the printer's)
`-gate`	point	none	injection moulding: estimate the fill from a gate at this point, x,y,z, moved to the nearest of the surface; as many as given (see dfm fill)
`-gates`	integer	none	injection moulding: estimate the fill from this many gates placed on each body, where no `-gate` is given (see dfm fill)
`-k-factor`	number	`0.5`	sheet metal: where a bend's neutral layer lies, from its inside, in thicknesses, for the flat pattern
`-material`	text	none	the material: for sheet metal, for the least bend radius it takes, one of: aluminium, aluminium-3003h, aluminium-half, copper, copper-quarter, stainless, steel, steel-drawing, titanium, titanium-4 (default steel); for moulding and casting, for its walls, a plastic or an alloy (an unknown name lists the process's; default abs, aluminium, gray-iron)
`-max-wall`	number	none	moulding and casting: the most wall, in mm (0: the material's; sand casting none)
`-min-draft`	number	`1`	moulding and casting: the least draft, in degrees, of a face along the pull
`-min-flange`	number	`4`	sheet metal: the least length of a flange from the bend's mould line, in thicknesses
`-min-hole`	number	none	printing: the least hole diameter, in mm (0: the printer's)
`-min-pin`	number	none	printing: the least pin diameter, in mm (0: the printer's)
`-min-wall`	number	none	moulding, casting and printing: the least wall, in mm (0: the material's or printer's)
`-overhang`	angle	`the printer's: am-fdm 45, am-sla 30, am-sls none, am-lpbf 45`	printing: the least angle, in degrees, from the bed a face looking down prints at unsupported; 0 for none
`-part-off`	number	`15`	sheet metal: the least angle, in degrees, a blank's ends meet its parallel edges at to be cut or parted off a strip
`-pocket-ratio`	number	`4`	machining: the most a face may lie below the stock's top, in diameters of the widest cutter that fits down to it
`-process`	process	required	the manufacturing process to check for, one of: machining, sheet-metal, injection-moulding, die-casting, sand-casting, am-fdm, am-sla, am-sls, am-lpbf
`-pull`	direction	`the direction of each body that leaves the least undercut`	moulding and casting: the direction the tool opens along: x, y, z or three numbers
`-radius`	number	`0.5`	moulding and casting: the least inside fillet radius, in nominal walls
`-section`	number	none	moulding and casting: the most a section may be, as the largest ball inside it, in nominal walls (0: the process's)
`-tol`	number	none	how near lengths must be to count as equal, in mm (0: a millionth of the model's size)
`-tool-radius`	number	`0.5`	machining: the smallest inside fillet a cutter makes, in mm
`-tool-sizes`	integer	`3`	machining: the most fillet radii one body should need
`-up`	direction	`the direction of each body that leaves the least to support`	printing: the build direction: x, y, z or three numbers
`-wall`	number	`1`	machining: the least wall between two holes, or a hole and the rest of the part, in mm

Output flags

Flag	Takes	Default	Meaning
`-json`	switch	off	print the result as JSON
`-q`	switch	off	print nothing but errors
`-skip`	names	none	switch off steps of the work by their names, separated by commas, as the built-in help lists them
`-v`	switch	off	also show the stages of each step, and their times

This page is generated from betti help dfm check. Lengths are absolute, or a percentage of the part's bounding-box diagonal, as in -size 1%.