3D Printed Threads

[Neil WyattModerator @neilwyatt]

Posted by Robin Hewitt 1 on 31/08/2017 18:27:44:

I printed a Dremel attachment, not exactly fine pitch but does the job.

Makes you wonder how we managed back when printers were dimensionally challenged

 

Good stuff. I remember seeing an article in ME about 3D printing some ten years ago including a little model ship that looked like it had been printed using a mastic gun…

This is from MEW just 5 years ago, an original RepRap:

Edited By Neil Wyatt on 31/08/2017 19:43:22

[RobinParticipant @robin]

I'm using the UP! Plus 2, I liked the way they used folded steel for the frame and profile rail for the slides, it looked comfortably rigid.

I now have a hankering for a second nozzle so I can print a dissolvable support structure. I can program to stop at preset thicknesses to add a bit of non-stick, but what a palaver.

I don't think the resin zappers have quite got it together yet. OTOH, something that would print wax shapes for a bit of investment casting could be fun.

[Nick HulmeParticipant @nickhulme30114]

Posted by Robin Hewitt 1 on 31/08/2017 20:54:40:

I don't think the resin zappers have quite got it together yet. OTOH, something that would print wax shapes for a bit of investment casting could be fun.

Robin,

Your printer should work fine with Machinable Wax's wax filament, you will probably need to swap out the extruder spring for something a little softer to allow optimal grip without crushing the wax, or there's Kai Parthy's Moldlay which doesn't burn out completely clean as the Machinable Wax product does but should be fine for larger parts.

– Nick

[Michael GilliganParticipant @michaelgilligan61133]

Neil,

The sectioning is a bit clumsy, I'm afraid [I had to do it with the hand microtome], but you might find these interesting:

.

.

MichaelG.

[Neil WyattModerator @neilwyatt]

Thanks Michael,

Certainly interesting to see.

My guess is I printed that with 0.1mm layers as it's a 0.7mm pitch thread.

The words that come to minds are 'Nyquist Criterion'.

Neil

[BazyleParticipant @bazyle]

We had a nice demo at EDMES on Friday evening using the old type printer pictured above. Perfectly functional for a bunch of fixtures, parts of a router and spark eroder and a cotton bobbin box he made for brownie points, including hinged lid. Even though he had transported it in the car 50 miles for the talk it didn't need recalibratone etc to print a nice bracket including hole and hex recess for bolt head.

He was using Fusion, then Slic3r then something like paradon? (well I remember it begins with P) to move the data to the printer. haven't seen that last piece of s/w mentioned before.

[Michael GilliganParticipant @michaelgilligan61133]

Neil,

One niggling little thought … The standard pitch for T2 is 0.75mm not 0.7mm

MichaelG.

[simondavies3Participant @simondavies3]

Posted by Bazyle on 09/09/2017 21:13:12:

We had a nice demo at EDMES on Friday evening using the old type printer pictured above. Perfectly functional for a bunch of fixtures, parts of a router and spark eroder and a cotton bobbin box he made for brownie points, including hinged lid. Even though he had transported it in the car 50 miles for the talk it didn't need recalibratone etc to print a nice bracket including hole and hex recess for bolt head.

He was using Fusion, then Slic3r then something like paradon? (well I remember it begins with P) to move the data to the printer. haven't seen that last piece of s/w mentioned before.

Pronterface?

I use it to control my printer directly and to estimate print times.

Simon

[jason udallParticipant @jasonudall57142]

The actual extrusion is not circular in cross section. .
The thickness is well controlled ( at least initially) but the width of the extrusion is somewhat controlled be the filament feed rate ( not confused with the nozzle movement rate in x,y,z)..thus you can extrude in one pass a ribbon 2-5 mm wide by say 0.1 mm thick..
The edges of the ribbon might (certainty ) not be square..but this geometry will depend on many things..surface tension , viscosity and the like , all dependent on extrusion temperature /material/infill among others. .a reasonable approximate would be semi circular of diameter equal to the layer height..
Some sagging occurs leaving the edge deformed from that simple shape. .effected by cooling profile. .

.
Nozzle size has an effect on the minimum scale printed (outside radius) and wall thickness ( minimum wall thickness)

Edited By jason udall on 09/09/2017 22:48:52

[Neil WyattModerator @neilwyatt]

Posted by Michael Gilligan on 09/09/2017 21:21:56:

Neil,

One niggling little thought … The standard pitch for T2 is 0.75mm not 0.7mm

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

Sorry, Neil; but I thought it worth mentioning before you go into production.

The same thread pitch [3/4mm] is used on filters, of course; which might add some frisson to that ever-popular 'decimal vs fractional' debate.

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by jason udall on 09/09/2017 22:44:53:

… The edges of the ribbon might (certainty ) not be square…

… a reasonable approximate would be semi circular of diameter equal to the layer height..

.

Which is, hopefully, visible in my photos.

MichaelG.

[Rod AshtonParticipant @rodashton53132]

What is the thread spec on a Dremel nose please?

[JasonBModerator @jasonb]

3/4" x 12 UNC

[Rod AshtonParticipant @rodashton53132]

Thanks Jason!

[RobinParticipant @robin]

Opinions on the Dremel nose thread vary. I have the Dremel 200 which I measured as M19x2.5

I printed the thread as a separate part then glued it in. Saved printing big, time consuming failures and allowed me to line the Dremel shaft lock button perfectly vertical.

I eventually printed it as M19.5×2.5 through a 16.5mm hole to get snug.

[Roderick JenkinsParticipant @roderickjenkins93242]

The Dremel nose thread is pretty slack. 3/4 BSF (55 degrees rather than 60) works well enough if you happen to have a tap.

Rod

[Neil WyattModerator @neilwyatt]

Posted by Michael Gilligan on 10/09/2017 08:57:56:

Sorry, Neil; but I thought it worth mentioning before you go into production.

The same thread pitch [3/4mm] is used on filters, of course; which might add some frisson to that ever-popular 'decimal vs fractional' debate.

MichaelG.

Just checked my 3D model and…. I used 0.75mm NOT 0.7mm, it's my memory that's wrong, not my design…. Phew!

[Michael GilliganParticipant @michaelgilligan61133]

[RobinParticipant @robin]

So it sounds like I have bought the Chinese knock off, metric threaded, Dremel clone from the Lucky Monkey Productorium in Guang Dong Province while you all have the pukka Yankee threaded, Imperial Dutch original.

Well, I am not going to let it bother me, but if I ever wanted to get one of these posh Dremels, like what you have, what do I look for? Where do I go?

[JourneymanParticipant @journeyman]

Just out of interest my various tables show 3/4" UNC as 10 pitch. This makes it practically interchangeable with an M19 2.5mm thread bar the crest and root shape. All the tables I looked at cunningly omit M19 showing just M18 and M20 which also have 2.5mm pitch. Of course I could be wrong, usually am

John

[Neil WyattModerator @neilwyatt]

The difference is about 0.3% on diameter and 1.5% on pitch.

The only way to be certain if the Dremel thread is metric or imperial would be to ask Bosch…

But I guess 3/4" is more likely than 19mm.

[JasonBModerator @jasonb]

Checked my taps down in the shed and as Rod says 3/4 x 12 BSF will fit as that is what I used to make a router plate for someone.

[Rod AshtonParticipant @rodashton53132]

Just got a 3/4 UNC tap off the bay at £6. That should clear my crappy Dremel printed router accessory. Thanks guys.

[Author]

Posts