I was trying to remove my stirrup to treat it with something to dampen vibration. The bolts were seized pretty good. I managed to get one out but for the life of me could not get the other. I ended up cutting the head off with a dremel tool and I am currently left with about 3/8" of bolt shaft to work with as seen here:
How can I get that screw out without having to drill it and tap it. I don't have that capability. I am afraid to cut a slot in it and to try to remove it with a slotted screw driver because I think there is not enough bolt diameter and it is pretty brittle steel. If i do that and fail I lose that much of my 3/8" to work with. Any help would be appreciated.
Thx
F
Last edited by Galgo on Sun Feb 02, 2014 8:31 am, edited 2 times in total.
I would try the opposite when it comes to heat.
Take advantage of the extreme cold. (Minus -17 Monday Night)
Put the bow out in the coldest temperature possible for few hours. Then attempt to remove the bolt thread.
The cold should cause the metals too shrink slightly hence possible aid in loosening.
Note: The thermal expansion and contraction of aluminium is double that of steel.
Better yet TRY thermally cycling
Another option is to add slight heat to the bolt thread first (ie soldering iron contact to heat just the thread) then place the crossbow in the extreme cold for rapid cooling after the heat expansion of the bolt thread.
Repeat cycle numermous times before trying to remove thread.
This may even help if loctite is involved
Last edited by colouredchameleon on Thu Jan 30, 2014 6:17 pm, edited 3 times in total.
when you get the vise grips clamed on don't just yank on em.
if it moves. then good. work the screw back and forth a few times easy does it.
then go a little more. work that back and forth. after a few regiments of this it will come on out.
i think i would do like the others said if you apply heat ,the aluminum will heat faster than the steel and help break the bond maybe even try and shield the bolt from the heat with a piece of tin .if it does not seem to work do it several times ,heat and cool then repeat
PUT IT IN THE BAG MARLIN ( #$%^ you it"ll bite)
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If you chose to heat the aluminium be aware there is a rubber / plastic pad between your limbs and the riser and your S5's . Melt them and you will only compound your problem.
Last edited by colouredchameleon on Thu Jan 30, 2014 6:38 pm, edited 1 time in total.
Great info guys thanks. I made a tactical error of not removing the string so I am pretty much stuck with the string and limbs on. I did move the bolt maybe 1/2 turn before it all went to hell and I have some dropped some oil on it in the hopes that it will penetrate. I guess I have to make sure the threads are clean of oil and really crank on the vice grips on as tight as possible. I recall watching an aircraft mechanic remove rusted screws by working them back and forth as you suggested so I will give it a try. Any other suggestions welcomed.
colouredchameleon wrote:You could make a temporary stirup out of rope to remove string Just tie it well
Good point now that I think of it I could reinstall the stirrup with one bolt and remove the string. I know the limb bolts are seized too so I probably will not touch those.
What??? If you heat the bolt, it'll expand in side the aluminium, and make it tighter,'especially of trying to cool the Al at the same time. I would try to make the rope stirup and get the string off, and then the limbs. A little heat on the al, and a good pair of vise grips,'and slowly turn back and forth. If you get to the point that the vise grips won't bite the bolt,and if your not a mechanical guy, I would suggest taking it to either a gun smith (I would think they could help) or a good machine shop. If you go any further than the vise grips, your looking at having to drill out the old bolt,and possibly having to tap, or rethread the hole. If you get off center a little, your drill bit will go into the Al, and then you have major problems.........RR
colouredchameleon wrote:I would try the opposite when it comes to heat.
Take advantage of the extreme cold. (Minus -17 Monday Night)
Put the bow out in the coldest temperature possible for few hours. Then attempt to remove the bolt thread.
The cold should cause the metals too shrink slightly hence possible aid in loosening.
Note: The thermal expansion and contraction of aluminium is double that of steel.
Better yet TRY thermally cycling
Another option is to add slight heat to the bolt thread first (ie soldering iron contact to heat just the thread) then place the crossbow in the extreme cold for rapid cooling after the heat expansion of the bolt thread.
Repeat cycle numermous times before trying to remove thread.
Roadrunnr72 wrote:What??? If you heat the bolt,it'll expand in side the aluminium, and make it tighter,'especially of trying to cool the Al at the same time.
Another option is to add slight heat to the bolt thread first (ie soldering iron contact to heat just the thread) then place the crossbow in the extreme cold for rapid cooling [color=#BF004i0]after the heat expansion of the bolt thread. [/color]
Repeat cycle numermous times before trying to remove thread.
This may even help if loctite is involved
OT
Roadrunnr72 please note bold red sections of what you imply I wrote and what ??? I actually wrote.
Galgo - good luck hope it works out for you
Last edited by colouredchameleon on Thu Jan 30, 2014 9:00 pm, edited 3 times in total.
