Has anyone ever mounted a Hack to a Bike Rigid...like welded the Hack & Bike as one? "SKULL"
This has been done with racing chassis and other types of rigs with special frames but is not usually all that successful with conventional bike frames with weld on sidecars. Some heavily gusseted and reinforced units may survive for a long time (think Baja 1000 rigs).
Usually the bike and sidehack frame are designed as one unit with the same grade, type and shapes of metal being utilized for compatability.
Lots of stresses are inherent, from the welding process and the ones due to the asymetrical vehicle design's road impacts. This will cause failure in stressed weldments of dissimilar metals sooner or later. Some relief from torsional stress and harmonics is afforded with bolt on connectors that can allow a bit movement to relieve this stress. That's why almost all sidehacks are attached this way.
Lonnie
never yet seen a rig that was set up spot on first time you always need to adjust so clamping is always the best option.
Hank
Thank's for the Info...makes sence! "SKULL"
Did'nt EML used to use rigid mount's for the top two, leaving the bottom two adjustable?
Safe riding Karl.
Originally written by outfit on 10/25/2008 8:45 PM
Did'nt EML used to use rigid mount's for the top two, leaving the bottom two adjustable?
Safe riding Karl.
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Welding mouts to bike frames is nothing new and has been done many times. It is not the common methiod of assembly today but is still done in some instances. Even with that being said what is welded to the chassis is typically just alug or mounting point here or there for an adjustable strut except in some off road or racing applications.
Here is a quote from Heddingham sidecars probably morso known in this country as the manufactrer of Unit leading links forks:
"Attachment of the sidecar to the motorcycle is by four straight fixings comprising internally threaded tubes with adjustable yokes manufactured. These stainless steel yokes are fixed to lugs welded (in the majority of cases) to the motorcycle frame or otherwise to the subframe, if fitted. Once again rigidity is of primary importance."
http://www.unitsidecars.co.uk/Body_details.htm
At the end of the day it is very important to relaize that to weld anything to a motorcycle frame one must know what he or she is getting into and be familar with that specific bike. Tubing wall thinknesses vary as does the material utilized. In most cases it is just best to shy away from it. Also it is really a good idea to have adjustment figured in.
