Hi all I want to increase a hole already drilled I I want to use a wood flat drill bit as I need a nut to sit in the recess. I know with a holes saw you can use ply to guide, any ideas with a wood flat drill bit. Can't see that method working Any ideas would be great
Are you drilling wood, or other? How thick is the material you are drilling? How deep do you need to drill into it? What size hole is drilled? What hole size do you need?
You can use a Forstner bit,perfect for the job, gives you a flat bottomed hole & you can still use your ply guide with it. You will need to remove from the hole your drilling every so often to clear the chips.
It will work fine with a flat bit, drill a hole through a scrap bit of ply, centre it over your existing hole, clamp and drill away.
They look very good, I noticed they cover all the plumbing sizes from 25mm & up to 117mm diameter. http://www.mtmc.co.uk/Dewalt-Self-Feed-Forstner-Bit-Drills__p-39037.aspx
The only problem with these is getting the speed and torque right. Too fast and the bit will heat up and lose its edge, some cordless drills are too slow and struggle with the torque.
I use the 50mm in a handheld mains power, I make up handrail and spindles with 2inch rounds and I could have hundreds of holes to do at any one time.
I have never used those Dewalts bits, so my comment maybe wrong on them, but you inspire confidence in me using them free hand. But, the larger bits, might not bit in like the smaller sizes possibly could.
You have to be ready for it, they take themselves in to the wood quite easily, but if you hit a knot it will let you know
I used to replace a lot of newels and spindles but haven't for a long time. Cutting off and coring out the old newel for pegs used to be a laborious job and had to be precise. Some of the pegs had to go 300mm into the old and new post. And as you say you never new if you would hit a knot, nail or anything else that would knock it off course or worse kick. I have an industrial grade Metabo mains drill that I use. At the time it was the only one I could find that had the speed, torque and clutch and would run without over heating
Have a cheapy set of Forstner bits so sure not best quality but as DIY, only used a couple of times, and only 35mm cutter for cabinet hinges Went to use recently and seemed blunt and slow to cut. Tried sharpening the flats with a fine file and now cuts better than when new Mind you, that MDF does knacker cutting tools / drills quicker than tree wood
Yes it does, MDF and laminate really do eat though blades! I have a own-brand Wickes bench grinder i use to sharpen chisels, some router bits and odd tools. Good bit of kit if you end up needing to sharpen stuff often.
Bench grinder! Treat yourself to a Whetstone sharpener like Scheppach 2000s or similar, best money I spent on one, puts an amazing sharp edge on a plane iron or chisel.