Stuff your 3D printer has made today...

[Onoff]

Making...work in progress. Got a busted shower control. There was a circa 6mm handle that snapped off. Idiot boy that I am tried to drill it out in situ.

https://flic.kr/p/2p5HnjN

https://flic.kr/p/2p5FLhD

Didn't figure until too late I could have removed the part. Consequently I drilled and tapped a new hole too far over It fouls the operation.

Looking to remake this with external indents to grip and no handle.

https://flic.kr/p/2pgVHAW

https://flic.kr/p/2pgVHxK

https://flic.kr/p/2pgVHxj

 

[Onoff]

Lad's first go:

https://flic.kr/p/2pgUgfy

https://flic.kr/p/2pgVWTn

Problem is the shower and printer are 12 miles away. So it's print a guess at the "gear" profile then travel to try it.

 

[ukracer]

I am trying to rack my brains to work out who actually posted the one I printed last time. Can't seem to.find them on Facebook or here.
It was done with openscad I think..

 

[MattF]

I cheated found the files online.

Do you have a link for those?

 

[My Old Landy]

I was printing some snowflakes for the Mrs and the filiment stopped feeding and subsequently the hot end jammed up. I can't sort it so I have ordered new parts.
The Ender 5 is now built but not tested. I still have this stupid chest infection and it is taking its toll.
Hopefully I will be back at it by the weekend

 

[Dr.Al]

For what it's worth, generating gears in OnShape only takes a couple of clicks - I used this to make one of the change gears for my Harrison M250:

 

[ukracer]

For what it's worth, generating gears in OnShape only takes a couple of clicks - I used this to make one of the change gears for my Harrison M250:

View attachment 425968

Not so simple with mine I think.
They are not straight.
I am pretty sure a guy on a Facebook forum sent me a file to print mine.

 

[Agroshield]

Gear dxf is free online and will generate a 2d dxf for any spur gear

GearDXF has the ability to extrude the gear, add a centre hole and ouput an STL file so you do not need anything else.

 

[fizzy]

Do you have a link for those?

Here you go!

Drummond lathe change gears by Elemanzer

This is a complete set of change gears for the type B (and others) Drummond lathe. The SCAD file can be modified to make gears with a non-standard number of teeth, however you will need Parametric Involute Bevel and Spur Gears by GregFrost. Download it at http://www.thingiverse.com/thing:3575

www.thingiverse.com

 

[fizzy]

Do you have a link for those?

Here you go!
No infill. Needs supports.

Drummond lathe change gears by Elemanzer

This is a complete set of change gears for the type B (and others) Drummond lathe. The SCAD file can be modified to make gears with a non-standard number of teeth, however you will need Parametric Involute Bevel and Spur Gears by GregFrost. Download it at http://www.thingiverse.com/thing:3575

www.thingiverse.com

 

[Agroshield]

I cheated found the files online.

And therein lies the problem of people who slavishly copy the original without giving any thought to how the gear will be produced. The recess in the gear has sharp sides, bad enough in metal as a stress riser, but so much worse in squirted plastic.

The other thing I have never seen in any gear software directed at 3D printing is the ability to alter the root of the tooth. For subtractively-machined (cut) gears, the root is a function of the swept path of the cutter. For additively manufactured ones, the root can be much more rounded, just to allow clearance with the mating gear, and thus much stronger.

 

[Agroshield]

Not so simple with mine I think.

FreeCAD can make helical gears. The challenge will be finding the specifications to use as input values.

 

[Dr.Al]

Not so simple with mine I think.
They are not straight.
I am pretty sure a guy on a Facebook forum sent me a file to print mine.View attachment 425969View attachment 425970

Yeah, that makes it more complicated! I'm sure it's "just" a case of drawing a spiral at the right helix rate and then extruding along that path, but it's definitely more than a couple of clicks! It also has the challenge of measuring the helix...

 

[daedalusminos]

There's one in F360...

 

[MattF]

Here you go!
No infill. Needs supports.

Drummond lathe change gears by Elemanzer

This is a complete set of change gears for the type B (and others) Drummond lathe. The SCAD file can be modified to make gears with a non-standard number of teeth, however you will need Parametric Involute Bevel and Spur Gears by GregFrost. Download it at http://www.thingiverse.com/thing:3575

www.thingiverse.com

Cheers.

 

[My Old Landy]

There's one in F360...

View attachment 425975

Is that the free version? I would like to know if I can generate one myself!

 

[Agroshield]

As we are talking about change gears, the ideas in these two might be useful:

https://www.thingiverse.com/thing:1808219 (could save a lot of filament)

https://www.thingiverse.com/thing:1802545 (uses an OpenSCAD library called puzzlecut: https://www.thingiverse.com/thing:35834)

 

[fizzy]

And therein lies the problem of people who slavishly copy the original without giving any thought to how the gear will be produced. The recess in the gear has sharp sides, bad enough in metal as a stress riser, but so much worse in squirted plastic.

The other thing I have never seen in any gear software directed at 3D printing is the ability to alter the root of the tooth. For subtractively-machined (cut) gears, the root is a function of the swept path of the cutter. For additively manufactured ones, the root can be much more rounded, just to allow clearance with the mating gear, and thus much stronger.

I know exactly how these should be done. Time wasn't on my side!

 

[daedalusminos]

Is that the free version? I would like to know if I can generate one myself!

Yes, select UTILITIES|ADD INS|SCRIPTS AND ADD INS, then scroll down to spur gear, select and press RUN

 

[ukracer]

Yeah, that makes it more complicated! I'm sure it's "just" a case of drawing a spiral at the right helix rate and then extruding along that path, but it's definitely more than a couple of clicks! It also has the challenge of measuring the helix...

https://m.facebook.com/groups/3DPrintingUsefulThings/permalink/1047165152295309/

Some interesting stuff in this thread.

I ended up with this file.
It printed well but was not the right size and I needed one quickly and it was 20 quid delivered.

But I would love to get one printed correctly at the right size to see how different materials hold up even as an experiment.

https://m.facebook.com/groups/3DPrintingUsefulThings/permalink/1047272392284585/