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Old 09-30-2014, 06:33 AM
Rex_Kelway Rex_Kelway is offline
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Default A hacks first hack - Motorcycle tank

Hello Shapers and Shapettes,

Rex thought He'd share His first real project He's working on. Rex's hammered out various shapes like bowls, guards and heatshields with varying levels of success but this is His first time aiming for a particular outcome.

Basically its supposed to be a custom tank for His Honda CB400F. Rex has an budget English wheel but aside from that, a stump, some tucking forks, a sandbag and a couple of basic 'ammers. Material is 1mm cold-rolled mild steel.

Bear in mind that He has no idea what He's doing but Rex'll try keep track of where he runs into problems and hopefully you guys might be able to offer some suggestions.


Buck and blanks




The first side was bent by hand, then had the low crown wheeled and the upper edge shrunk to wrap the curve around the horozontal.



On the second side Rex wrapped it around the buck first, then shrunk the upper edges at varying depths and used a combination of sandbag and wheel to create the crown.



Both panels had waaaayyyy to much crown in areas but working back and forth between the buck they were 'adjusted' out and fit better. Well enough to put a smile on His head.


First main problem He's come up against is that His shrinking hammer might be to savage.

When hammering down puckers/tucks each progressive blow down the length seems to turn the tuck inside-out. Then when flattened out the shrink process has been very effective but leaves a 'weld-bead' look that seems impossible to planish properly. Even with hours of light planishing it seems that the area stretches too much before getting anywhere near flat.

Should Rex go with a gentler shrinking hammer?





More to come as He works through it.
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Last edited by Rex_Kelway; 09-30-2014 at 05:37 PM.
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Old 09-30-2014, 08:51 AM
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Pokie Pokie is offline
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Looking good so far, keep us updated.
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Old 09-30-2014, 09:05 AM
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Richard K Richard K is offline
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Why not ask Rex?

Maybe he doesn't want you pounding on his project.

Maybe Rex can't do any better than he has already done.

Or: I'd suggest Rex should write his own post. Then he could ask us himself what to do.
I would like to hear from him so that I might answer his direct question.
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Last edited by Richard K; 09-30-2014 at 09:09 AM.
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Old 09-30-2014, 09:27 AM
Bulletbill Bulletbill is offline
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Quote:
Originally Posted by Richard K View Post
Why not ask Rex?

Maybe he doesn't want you pounding on his project.

Maybe Rex can't do any better than he has already done.

Or: I'd suggest Rex should write his own post. Then he could ask us himself what to do.
I would like to hear from him so that I might answer his direct question.

Richard,

Rex speaks about himself in the third person.

When you read his posts you have to use the following filter; "Roses are red. Violets are blue. I'm Schizophrenic. And so am I."
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Last edited by Bulletbill; 09-30-2014 at 09:30 AM.
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Old 09-30-2014, 09:34 AM
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MP&C MP&C is offline
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Rex is off to a good start. On the tuck shrinks, I would suggest a Kirk style hammer that has a slight taper or radius added to the front to help eliminate some of the issues Rex is having with fold over. If you look at the flattened tuck near the long red line in picture 1, it shows something similar to a weld bead, but much flatter with less distortion than what Rex showed. Perhaps if Rex could modify his hammer to become a tucking hammer, it may help to eliminate the distortion. While hammering on the tuck, if Rex could concentrate on the high spots of the tuck it may help as well. When the center of the tucks begin to droop, forming what appears to be two tucks, now treat these as individual tucks and hammer each one individually to bring down the high spots.. then continue. Good luck to Rex.









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Old 10-02-2014, 05:56 AM
Rex_Kelway Rex_Kelway is offline
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Thankyou for the help shapoids.

Rex thought He'd show an almost step by step of His process that leads to the trouble. Also His solution...

This is Rex's tool. One of them atleast...


Pucker/Tuck formed. The idea being to use the most vertical sides possible to increase the amount force it takes to spread the base out. Hopefully turning that resistance into plastic deformation and thickness captured in the sides.


End Peined over. 'Cos he read it somewhere... Also his makeshift round nose hammer (the devil hammer as it seems).



First round of hammering the tuck down. Each blow seems to turn the tuck inside out, leaving a deformed weld-bead appearance.



The same tuck basically worked flat. While it's pulled about 1.5mm out of the edge at this point it's pointless if all that length is just captured in an uneven surface that is a nightmare to planish out.



Rex has had better results with this other makeshift mallet. It has a far blunter nose and damages the surface a lot less. The tuck seems to flatten rather than invert. It's made from a pine post, a broken broom handle and odd motorcycle grip. Rex prefers the light hammer. It feels nicer to use His strength to swing a hammer instead of fighting with the weight. Easier on the wrist.



It gathers less than half as much metal in terms of shrinkage but atleast it leaves a surface that He can work with. This is three tucks with the pine mallet and about 30sec of planishing. A far better result He thinks.




After all that. The first round of sandbag of the top panel.






More to come...
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