The threaded core section is 7.5mm a book i have says 70-90% depending on the wood.
The screws are for attaching a bench top to legs which i doweled a section straight on top of. The top is douglas fir the leg stretcher..thing is larch. I plan to oversize the pilot holes at the back but not the front of the bench.
I think the doglas fir is probably similar to cherry, it is tight grained american type. So 80% sounds right, the core is 7.5 and 80% of that is 6mm. Towards the head the core expands quite a bit so i guess i migjt have to make a seperate pilot hole for this section too?
Does this sound right? Ive not used coach screws before and dont want to mess the bench up..
Thanks
The screws are for attaching a bench top to legs which i doweled a section straight on top of. The top is douglas fir the leg stretcher..thing is larch. I plan to oversize the pilot holes at the back but not the front of the bench.
I think the doglas fir is probably similar to cherry, it is tight grained american type. So 80% sounds right, the core is 7.5 and 80% of that is 6mm. Towards the head the core expands quite a bit so i guess i migjt have to make a seperate pilot hole for this section too?
Does this sound right? Ive not used coach screws before and dont want to mess the bench up..
Thanks
