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Author: Subject: Novice ML7 user needs advice
johnH20
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posted on 27/5/14 at 06:42 PM Reply With Quote
Novice ML7 user needs advice

Managed to buy an ML7 a couple of years ago. ( Wish I had done it 10 years ago when I retired but that is another story ). I have learned to do basic turning and boring and am now about to attempt tapers, but I aspire to make some intake trumpets with bell mouth openings. How do I do this? Do I need to grind a special tool or is there a trick to use a single point tool to execute a radius in the horizontal plane? I cannot figure this out. For info I have a 4 position turret type tool holder. TIA.
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big_wasa
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posted on 27/5/14 at 06:57 PM Reply With Quote
If turning between centres you can offset the tailstock.



Or you can use the compound slide.




For the radius you could use a ball turning attachment .

[Edited on 27/5/14 by big_wasa]
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robinj66
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posted on 27/5/14 at 07:04 PM Reply With Quote
Have a look at this series of videos - Tubelcain - I know the lathe is an Atlas but it's very similar to yours.

Also this may be helpful
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theprisioner
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posted on 27/5/14 at 09:37 PM Reply With Quote
I thought trumpets spun using a bending technique (tool) while spinning the job?




http://sylvabuild.blogspot.com/

http://austin7special.blogspot.co.uk/
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davidimurray
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posted on 28/5/14 at 08:15 AM Reply With Quote
Have a look for a "Ball Turning Attachment"




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designer
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posted on 28/5/14 at 08:16 AM Reply With Quote
Trumpets are a lot better spun rather than turned. And a lot quicker.
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johnH20
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posted on 28/5/14 at 11:23 AM Reply With Quote
Well, I need to look into the dark art of spinning as well, another skill I do not have. Thanks for the advice and links folks.
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big_wasa
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posted on 28/5/14 at 11:38 AM Reply With Quote
Well if you make a former from alloy you could then lay them up in carbon fibre.
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r1_pete
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posted on 28/5/14 at 11:53 AM Reply With Quote
This may help with your trumpet design :

Trumpets
Trumpets
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Uphill Racer
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posted on 3/6/14 at 12:07 AM Reply With Quote
quote:
Originally posted by big_wasa
Well if you make a former from alloy you could then lay them up in carbon fibre.


You could also use the former to swage them, that is how i made mine.
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