A ghastly bodge

[RobinParticipant @robin]

A poor job trying to unblock a 0.4mm nozzle and it was became an ex-0.4mm nozzle

The new ones are $30 but only £1.50 from the Bay of Fleas/Guangdong province. So I order 4 pcs and some weeks later here they are.

Unfortunately they are threaded M6x1 where the genuine parts are threaded M6x0.75 I tried whinging but all I got was an instant refund and told to keep them ad gratis.

The temptation is to rethread them with the M6x0.75 plug tap I just purchased. Alternatively I could tool up and make a pile of them.

Think I'll see how the rethreading goes first

[RobinParticipant @robin]

[RobinParticipant @robin]

The M6x0.75 didn't look much like my idea of a bottoming tap but a quick whizz on the bench grinder brought it back to spec. The crossed thread is not exactly pretty but proof of the pudding is in the eating and I see no leaks…

Question is do I tool up to make some?

[Neil WyattModerator @neilwyatt]

I'm sure I replied to the first post but… well done, surprised it's leak free but if it works.

Neil

[Nick HulmeParticipant @nickhulme30114]

You should do what you fancy but if a cheapie is fully functional with a couple of turns of a tap you could spend the time on something you don't have/can't buy.

I understand the attraction of spending lots of time making something you can easily and cheaply buy/modify if you have nothing else to do though.

– Nick

[Marcus BowmanParticipant @marcusbowman28936]

Is there room to make a short adapter?

Marcus

[RobinParticipant @robin]

After watching all those episodes of How it's Made I get terrible urges to set up my CNC mill with a whole mess of bits and HSS cutters screwed to the bed. Sadly the bodge works so well (touch wood) I have no need.

I don't actually know what blocked the nozzle in the first place. I always take the filament through a foam wiper to displace gunge and I use brass tweezers to remove the drool. It can't be swarf from the thread cutting because it seals below the thread.

A mystery.

[Clive IndiaParticipant @cliveindia]

Posted by Robin on 21/09/2017 18:41:03:

Question is do I tool up to make some?

You are obviously unhappy so the answer is yes.

Presumably the seal is down the bottom and the threads just keep it in position so performs its function.

For me – it works and there is no visible evidence of the bodge so why worry?

[Nick HulmeParticipant @nickhulme30114]

Posted by Robin on 30/09/2017 08:47:11:

After watching all those episodes of How it's Made I get terrible urges to set up my CNC mill with a whole mess of bits and HSS cutters screwed to the bed.

Why not drag yourself into the 20th Century and mill it? Thread milling is as cool as a hippy penguin's Jesus sandals

[David Standing 1Participant @davidstanding1]

Posted by Neil Wyatt on 21/09/2017 20:33:56:

I'm sure I replied to the first post but.

Neil

Perhaps in a burst of self flagellation you deleted it?

[MWParticipant @mw27036]

Robin, oh, my friend, you haven't seen a ghastly bodge until you've seen my first copper boiler.

This has become nigh infamous, and one I certainly wont live down here…

So don't be so hard on yourself!

Michael W

[RobinParticipant @robin]

Posted by Michael-w on 02/10/2017 14:48:50:

Robin, oh, my friend, you haven't seen a ghastly bodge until you've seen my first copper boiler.

This has become nigh infamous, and one I certainly wont live down here…

I cannot be reassured until I have seen this boiler.

A picture is required to make me feel better

[MWParticipant @mw27036]

Posted by Robin on 02/10/2017 16:20:24

I cannot be reassured until I have seen this boiler.

A picture is required to make me feel better

I will have to trudge the depths of the forum/computer and see if I can find a picture, it's a dust catcher in my shed and i'm not sure where it went.

I'll simply drop it in my album because posting here would "trigger" me and my right to a safe space.

[RobinParticipant @robin]

Posted by Nick Hulme on 02/10/2017 12:06:12:

Why not drag yourself into the 20th Century and mill it? Thread milling is as cool as a hippy penguin's Jesus sandals

Last time I looked thread milling cutters were priced the same as relics of the true cross. Have they made progress in the direction of affordable?

[Phil WhitleyParticipant @philwhitley94135]

You could contact the seller in Guadong and ask for some jets drilled, but not threaded, or even ask for them in M6x.75, they can be very accommodating, sometimes you are dealing direct with a maker who has one machine that makes one part!!

[Nick HulmeParticipant @nickhulme30114]

Posted by Robin on 02/10/2017 18:06:18:

Have they made progress in the direction of affordable?

I guess it depends what you think is expensive, I check various sites on a weekly basis against a list of wants which include thread-mills and have picked up mine for between £5 and £50 in sizes from M2.5 internal to stuff with 14mm shanks, I think my 0.75 pitch thread-mill was about £25

If you find one that looks like this one –

http://www.carmex.com/var/files//thumb/1760

with the correct thread angle you you can grind off all but one row of teeth and cut a reasonable range of threads with one cutter.

[RobinParticipant @robin]

Posted by Phil Whitley on 02/10/2017 18:12:03:

You could contact the seller in Guadong and ask for some jets drilled, but not threaded, or even ask for them in M6x.75, they can be very accommodating, sometimes you are dealing direct with a maker who has one machine that makes one part!!

I don't speakee Mandarin, they don't understand English…

Size: 1.75/0.4mm
We not have sell 0.75.
The goods what you see is what you get ,like our website's picture show.
Please read the goods & shipping description cleared before your bid.
Thank you
Elf/Service

[RobinParticipant @robin]

MSC have a M6x0.75 thread mill for £58.32 + tax

It looks so fragile. Ping, goodbye £58.32

Taper and plug M6x0.75 from China £4.07 grind the end off, don't care.

I don't think I am cheap, but if there is doubt I am prepared to ask her indoors for an adjudication

[Neil WyattModerator @neilwyatt]

As the hot end is just an aluminium block, why not make a new one with n M6 threaded hole for the nozzle, then you can use bog-standard nozzles that cost about £1.50 for 10?

Neil

[RobinParticipant @robin]

These things? They are so last year

[Russ BParticipant @russb]

Posted by Neil Wyatt on 03/10/2017 09:28:50:

As the hot end is just an aluminium block, why not make a new one with n M6 threaded hole for the nozzle, then you can use bog-standard nozzles that cost about £1.50 for 10?

Neil

I've just read every post here to see if it had been suggested……. and then you pipped me to it Neil.

If these bespoke nozzles are $30 a pop – I'd do exactly as Neil said and just make a new hot end! To be more precise, I'd remachine the existing one to accept the standard M6 male nozzles.

I would also move the NTC thermister to the opposite side of the block to the ceramic heater, it's practically sitting on it at the moment, you're hot end could be colder than you think.

[Nick HulmeParticipant @nickhulme30114]

Posted by Robin on 03/10/2017 08:35:32:

MSC have a M6x0.75 thread mill for £58.32 + tax

It looks so fragile. Ping, goodbye £58.32

I've only milled a few hundred threads, some of them M2.5 internal, but I've never broken a thread-mill, I've shifted substantial material with 0.6mm carbide end mills too and I'm still on the first one out of the pack.

I think I'd shy away from such tooling too if my experience with the 0.6 end mills on the CNC hadn't shown me that with the correct feeds and speeds I was the only limiting factor in the use of such fine, delicate tooling,

– Nick

[RobinParticipant @robin]

Ballpoint pen tip for scale…

Edited By Robin on 04/10/2017 14:44:14

[Nick HulmeParticipant @nickhulme30114]

Proving which posited theory in the above thread ?

😀

[RobinParticipant @robin]

I have thought long and hard about this…

I think it proves that my fear of breaking a spindly £58.32 + vat tool is probably irrational.

It also suggests that you think I should use logic to overcome my irrational fear.

However, if I use logic, surely my logic will remind me that I already have a working solution.

So this really comes down to how smug I could feel after successfully thread milling a smallish blind hole.

Difficult

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