Has it been left to rust?
Sound implausible that it won't budge after all these attempts.
Sound implausible that it won't budge after all these attempts.
No been using it all last week but blade is knackered from cutting a bit of laminate so come to change it. It's not 1st time its stuck either but managed to get it off after 2hrs at it before with a mate. This time it just wont move
When you did it last time did the screw go back in easily enough to run it up finger tight or was it tight from the start?
Thinking it may be cross threaded when last replaced, especially if an impact driver was used. Have you used any form of thread lock adhesive when you last did it?
As stated, to undo these bolts you tuen them clockwise after locking the blade securely. Some blades have a series of holes at the bottom of a split. These can sometimes be used to push a screwdriver through and prevent the blade from turning. Rather than striking an allen key with a mallet try using an extension tube on the long end whilst keeping pressure on the short end so it doesn't twist out of the bolt head. Gentle 'bouncing' the extended end may work better than continuous pressure. Spray some releasing fluid between the blade and bolt head and allow to soak in for 10 minutes before trying to undo the bolt.
If all else fails you could try playing a blow torch flame on the bolt head to heat it up but it has to be a bit of a fierce flame to concentrate the heat on the bolt before it heats the surrounding area. Ensure there are no flammable materials around and, if you have used penetrating oil, the area id dry and dust free. Best done outdoors unless you have a large workshop.
Thinking it may be cross threaded when last replaced, especially if an impact driver was used. Have you used any form of thread lock adhesive when you last did it?
As stated, to undo these bolts you tuen them clockwise after locking the blade securely. Some blades have a series of holes at the bottom of a split. These can sometimes be used to push a screwdriver through and prevent the blade from turning. Rather than striking an allen key with a mallet try using an extension tube on the long end whilst keeping pressure on the short end so it doesn't twist out of the bolt head. Gentle 'bouncing' the extended end may work better than continuous pressure. Spray some releasing fluid between the blade and bolt head and allow to soak in for 10 minutes before trying to undo the bolt.
If all else fails you could try playing a blow torch flame on the bolt head to heat it up but it has to be a bit of a fierce flame to concentrate the heat on the bolt before it heats the surrounding area. Ensure there are no flammable materials around and, if you have used penetrating oil, the area id dry and dust free. Best done outdoors unless you have a large workshop.
The 'wrong way thread' is designed to self tighten, when the the blade is in use. Any slippage between blade and the arbour will make the fixing bolt extremely tight.