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squishio |
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squishio Spanner Monkey
Joined: 07 Jul 2007 Karma :
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Posted: 21:34 - 13 Dec 2017 Post subject: Cutting a wobbly curve consitently on a bandsaw |
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Hi Guys,
Bit of an odd one, I need to cut the below curve along the length of a 45mm aluminium tube (300mm long)
I'm practicing with some PVC at the moment, but for a start I'm struggling to get the exact shape I want, then the next problem will be to be able to repeat the same cut consistently (need 8 of the same)
https://cdn.bcf.44bytes.net/files/outline_small.jpg
(ignore the top straight line, thats side of the tube, its just the wiggly one I need to cut.
If this was a flat piece, I could just print and stick my drawing to the material, I have tried stretching the image and wrapping it round the tube once which sort of worked but am not convinced.
Can anyone suggest anything?
Cheers! ____________________ Current - Hornet 600, Transalp 650, X140 Pit, GPZ400R
Past - SY125, GT250, GT650, CX400, CBF600, Bandit 600, SL1000, GT250 |
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Ste |
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Ste Not Work Safe
Joined: 01 Sep 2002 Karma :
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Posted: 21:38 - 13 Dec 2017 Post subject: |
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I'd pay a metal fabricator to do it. |
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bamt |
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bamt World Chat Champion
Joined: 15 Dec 2013 Karma :
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BTTD |
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BTTD World Chat Champion
Joined: 22 Nov 2012 Karma :
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Dave.... |
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Dave.... Trackday Trickster
Joined: 13 May 2016 Karma :
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Posted: 22:30 - 13 Dec 2017 Post subject: |
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If band saw is only option and consistency is required a jig would be best but I guess that has to be right first time.
Cutting tube is hard at best of times and a band saw is a bit near as damn it sort of tool anyway.
You would need a square block longer than part to be cut with hole bored to suit tube and then cut the flat pattern through that but keeping it in one piece. Every part would be the same thereafter following the saw cut.
Failing that use https://www.youtube.com/watch?v=XygNK1kVKD0 which is what I may consider or a water-jet cutter if accurate consistency is required. ____________________ Honda Africa Twin |
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duhawkz |
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duhawkz World Chat Champion
Joined: 03 Dec 2006 Karma :
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c_dug |
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c_dug Super Spammer
Joined: 04 Sep 2007 Karma :
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Posted: 23:40 - 13 Dec 2017 Post subject: |
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I hate bandsawing tube.
Do you have spare tube length and a small machine vice?
If I had to do it at work I'd mark the tube up with sharpie. Then I'd give it to some other poor schmuck to do the hard bit (because perks of being the boss), but assuming that isn't an option, i'd maybe clamp the end very hard in a machine vice, with the bit you want to cut poking out, and try and cut close to the sharpie line, then file it finished or die grind it or something. It'd probably vibrate like a bastard and make all sorts of horrible noises! But otherwise I just see it spinning if I'm picturing what you're trying to do properly.
maybe I'd try and Mill it instead, pop it in a rotating vice or something and try and follow the line that way. Guessing that isn't an option for you?
As somebody who has reason to professionally bandsaw stuff on a reasonably regular basis, I'd still not fancy doing that repeatedly accurately on one. And sod all the faff of making a jig out of wood.
Did I mention I hate bandsawing tube?
This sort of job is where CNC really excels! ____________________ I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock. |
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kramdra |
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kramdra World Chat Champion
Joined: 28 Oct 2010 Karma :
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Omega |
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Omega Crazy Courier
Joined: 07 May 2009 Karma :
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Posted: 02:53 - 14 Dec 2017 Post subject: |
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Could you just change the design so these awkward parts aren't needed ? |
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BTTD |
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BTTD World Chat Champion
Joined: 22 Nov 2012 Karma :
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bugeye_bob |
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bugeye_bob World Chat Champion
Joined: 05 Sep 2013 Karma :
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fatjames |
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fatjames World Chat Champion
Joined: 09 Jul 2011 Karma :
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Posted: 15:27 - 14 Dec 2017 Post subject: |
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3D print FTW ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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nowhere.elysium |
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nowhere.elysium The Pork Lord
Joined: 02 Mar 2009 Karma :
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Old Thread Alert!
The last post was made 6 years, 134 days ago. Instead of replying here, would creating a new thread be more useful? |
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