On Thu, 22 May 2025 at 21:28, Chris Albertson <albertson.ch...@gmail.com>
wrote:
> THAT is a true “conversational” design system. And I don’t think it is
impossible. Someone just needs to work on it. The technology is present,
but I doubt anyone has yet applied it to 3D modeling for manufacturing.
Have you tried?
This is Claude:
*Andrew Pugh 22/05/2025, 22:06:55I use Fusion 360Please design a handle for
a 90th percentile human hand that includes a trigger.Supply the result as
am F3D file. *
Claude 3.7 Sonnet 22/05/2025, 22:07:08
# Designing a Handle with Trigger for 90th Percentile Human Hand
I'd be happy to discuss designing an ergonomic handle with a trigger for a
90th percentile human hand in Fusion 360. While I can't directly create and
provide an F3D file (as I don't have the capability to generate and share
files), I can walk you through the design process you could follow in
Fusion 360.
## Design Considerations for 90th Percentile Hand
For a 90th percentile male hand, we're looking at approximately these
dimensions:
- Hand length: ~205mm (8.1")
- Hand breadth: ~95mm (3.7")
- Grip diameter comfortable range: ~50-60mm (2-2.4")
- Trigger finger length: ~80mm (3.1")
## Design Process in Fusion 360
### 1. Initial Setup
- Create a new design in Fusion 360
- Set up a proper coordinate system with the handle oriented vertically
### 2. Creating the Main Handle Body
- Start with a cylinder (50-55mm diameter) as the base grip form
- Use the Sculpt environment to create an ergonomic shape
- Taper the diameter slightly - wider at the top, narrower at the bottom
- Add palm swell in the middle for comfort
- Create finger grooves on the front face (approximately 20mm width each)
### 3. Trigger Guard and Trigger Design
- Create a trigger guard loop with approximately 30mm interior width and
70mm height
- Position the trigger about 40mm from the back of the grip
- Design the trigger with a curved face (approximately 20mm width)
- Allow about 10-15mm of trigger travel
- Include a comfortable radius on the trigger face (approximately 8mm)
### 4. Ergonomic Refinements
- Add texturing to the grip surfaces
- Create thumb rests on both sides (for ambidextrous use)
- Round all edges with at least 2-3mm fillets for comfort
- Add slight contouring at the top of the back strap
### 5. Mechanical Considerations
- Design internal channels for any needed mechanisms
- Add mounting points for attaching to your device
- Include reinforcement ribs internally if needed for structural integrity
### 6. Saving the File
- Save as an F3D file through File > Save As
- Consider also exporting as STEP or STL for compatibility
## Next Steps
To create this design in Fusion 360, I'd recommend starting with reference
imagery of ergonomic handles and perhaps even making a clay prototype to
test the grip before finalizing your CAD design. The Form modeling
environment in Fusion 360 would be particularly useful for creating the
organic curved surfaces needed for ergonomic hand contact.
Would you like more specific guidance on any particular aspect of this
design process?
*Andrew Pugh 22/05/2025, 22:08:15Can you supply the geometry as OpenSCAD
input?*
Claude 3.7 Sonnet 22/05/2025, 22:08:41
# OpenSCAD Handle with Trigger for 90th Percentile Hand
Here's the OpenSCAD code to generate a handle with trigger designed for a
90th percentile human hand:
```openscad
// Handle with Trigger for 90th Percentile Hand
// Measurements based on anthropometric data for 90th percentile male hand
// Parameters
grip_diameter = 55;
grip_height = 120;
grip_taper_top = 1.1;
grip_taper_bottom = 0.9;
palm_swell = 1.15;
trigger_guard_width = 30;
trigger_guard_height = 70;
trigger_guard_thickness = 8;
trigger_width = 20;
trigger_height = 40;
trigger_depth = 12;
trigger_curve = 8;
trigger_angle = 15;
finger_groove_depth = 3;
finger_groove_width = 20;
num_finger_grooves = 3;
// Main grip body
module main_grip() {
// Tapered cylinder for basic grip shape
difference() {
union() {
// Base handle shape with palm swell
for (i = [0:grip_height-1]) {
// Calculate diameter modifier based on position
palm_factor = 1 + (palm_swell-1) * sin(180 * i /
grip_height);
taper = grip_taper_top - ((grip_taper_top -
grip_taper_bottom) * i / grip_height);
diam = grip_diameter * taper * palm_factor;
translate([0, 0, i])
cylinder(h=1.01, d=diam, $fn=60);
}
}
// Create finger grooves
for (i = [0:num_finger_grooves-1]) {
translate([grip_diameter/2, 0, 30 + i*finger_groove_width])
rotate([0, -90, 0])
scale([1.5, 1, 1])
cylinder(h=finger_groove_depth*2,
d=finger_groove_width, $fn=40);
}
// Thumb rest (right side)
translate([-grip_diameter/2-1, 10, 70])
rotate([0, 90, 0])
scale([2, 1, 1])
cylinder(h=finger_groove_depth+2, d=30, $fn=40);
// Thumb rest (left side - for ambidextrous use)
translate([-grip_diameter/2-1, -10, 70])
rotate([0, 90, 0])
scale([2, 1, 1])
cylinder(h=finger_groove_depth+2, d=30, $fn=40);
// Trigger cavity
translate([grip_diameter/4, 0, trigger_guard_height/2 + 20])
cube([grip_diameter, trigger_guard_width+5,
trigger_guard_height], center=true);
}
}
// Trigger guard
module trigger_guard() {
translate([0, 0, trigger_guard_height/2 + 20]) {
difference() {
// Outer shape
union() {
// Front vertical part
translate([grip_diameter/2 - trigger_guard_thickness/2, 0,
0])
cube([trigger_guard_thickness, trigger_guard_width,
trigger_guard_height], center=true);
// Bottom curved part
translate([grip_diameter/2 - trigger_guard_thickness/2 -
trigger_guard_height/2, 0, -trigger_guard_height/2])
rotate([90, 0, 0])
cylinder(h=trigger_guard_width,
d=trigger_guard_thickness, center=true, $fn=40);
// Bottom horizontal part
translate([grip_diameter/2 - trigger_guard_height/2, 0,
-trigger_guard_height/2])
cube([trigger_guard_height, trigger_guard_width,
trigger_guard_thickness], center=true);
}
// Inner cutout
translate([grip_diameter/2 - trigger_guard_thickness/2 -
trigger_guard_height/4, 0, -trigger_guard_height/4])
scale([1.2, 0.8, 0.8])
sphere(d=trigger_guard_height, $fn=60);
}
}
}
// Trigger
module trigger() {
translate([grip_diameter/4, 0, trigger_guard_height/2 + 20]) {
difference() {
union() {
// Trigger base
translate([0, 0, -5])
cube([trigger_depth, trigger_width, trigger_height],
center=true);
// Curved trigger face
translate([trigger_depth/2, 0, -5])
rotate([90, 0, 0])
cylinder(h=trigger_width, d=trigger_curve*2,
center=true, $fn=40);
}
// Angle the bottom of the trigger
translate([0, 0, -trigger_height/2])
rotate([0, trigger_angle, 0])
cube([trigger_depth*2, trigger_width+1,
trigger_height/2], center=true);
}
}
}
// Generate the complete handle
module complete_handle() {
main_grip();
trigger_guard();
trigger();
}
complete_handle();
```
## Features of This Design:
1. **Ergonomic Main Grip:**
- Tapered design (wider at top, narrower at bottom)
- Palm swell in the middle for comfort
- Finger grooves on the front face
- Ambidextrous thumb rests on both sides
2. **Trigger Guard:**
- Properly sized for a 90th percentile hand (30mm width)
- Rounded edges for comfort
- Integrated with the main handle
3. **Trigger:**
- Curved face for ergonomic finger contact
- Angled bottom edge for natural finger positioning
- Sized for comfortable operation
## Customization Options:
You can adjust any of the parameters at the top of the code to customize
dimensions:
- Change `grip_diameter` and `grip_height` to adjust overall size
- Modify `palm_swell` factor to change the grip profile
- Adjust `trigger_guard_width` and `trigger_guard_height` for different
finger room
- Change `finger_groove_depth` and placement for different ergonomics
To render this in OpenSCAD, simply copy the code into a new file and save
with a .scad extension.
So I did that, then imported it into Fusion so that I could share it.
It's not so much how well the pig sings, but that it sings at all....
https://a360.co/44Rztgq
On Thu, 22 May 2025 at 21:28, Chris Albertson <albertson.ch...@gmail.com>
wrote:
> The problem with all programmed solutions, g-code, openscan, or Python, is
> that you are only going to make shapes that are programmable. Generally
> these are geometric shapes. Just TRY can program a DeWalt cordless drill
> body or a prosthetic hand. or even a pair of in-ear headphones, a modern
> carbon fiber bicycle frame, running shoe insoles, or, in my case, robot
> parts. Most products in the world today are NOT geometric shapes.
>
> People like to build organic shapes with 3d compound curves.
>
> What is the best user interface that is easy to learn? I think the
> answer will be an AI that understands English (or Chinese or whatever).
> You will say or type “Mr AI, please make a handle suitable for 90% of all
> adult-sized human hands, include a speed control trigger”. Up comes a 3D
> render that you can inspect. Then you say “I think it needs to be longer
> and the grip area needs a rubber over-molding with leather grain texture.”.
> Then finally you say “This part will be injection molded, please create
> g-code for an aluminum mold."
>
> THAT is a true “conversational” design system. And I don’t think it is
> impossible. Someone just needs to work on it. The technology is present,
> but I doubt anyone has yet applied it to 3D modeling for manufacturing.
>
>
>
>
>
>
>
> > On May 22, 2025, at 11:59 AM, gene heskett <ghesk...@shentel.net> wrote:
> >
> >
> > On 5/22/25 12:36, John Dammeyer wrote:
> >>
> >>>> On Thu, 22 May 2025, 11:05 John Dammeyer, <jo...@autoartisans.com>
> >>> wrote:
> >>>>> Got Path Pilot installed on a PC today. Overall the user interface
> is
> >>>>> nice,
> >>>>> simple and probably somewhat idiot proof.
> >>>>>
> >>>>> So far haven't yet been able to integrate it into my network
> although it
> >>>>> does have Samba. But then I've had trouble getting Linux Mint to
> talk
> >>>>> nicely to the Windows network too.
> >>> Getting rid of windows gets rid of samba/cifs. I use sshfs or its kin
> >>> for all such intersystem operations, once setup, it Just Works.
> >>
> >> Hey Gene,
> >> Dumping Windows isn't an option. There's way too much stuff that just
> doesn't run under Linux or a virtual box and I have no intention of
> throwing away 40 years of work.
> >> John
> > That is your prerogative John, but python3 is claimed to work on either.
> While removing the sideboards windows seems/wants to impose. I wish I
> understood python3 better myself, but at 90 yo I'm running out of time and
> short term memory so OpenSCAD is likely the last language I'll teach
> myself. OTOH, I've had a heck of a ride thru the broadcasting industry,
> but its now winding down as my diabetes takes over, leaving my fingerprints
> here and there in some pretty impressive places. So have you and I respect
> that. But when a better solution presents itself, I like to explore the
> possibilities. Most recently those presented by the closed loop
> stepper/servo's I've found make a whole new machine in terms of speed AND
> accuracy if fully exploited. Good luck & God Bless.
> >>
> >>
> >> _______________________________________________
> >> Emc-users mailing list
> >> Emc-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> >> .
> >
> > Cheers, Gene Heskett, CET.
> > --
> > "There are four boxes to be used in defense of liberty:
> > soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author, 1940)
> > If we desire respect for the law, we must first make the law respectable.
> > - Louis D. Brandeis
> >
> >
> >
> > _______________________________________________
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
>
> _______________________________________________
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912
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