Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
|
#1
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
I need to send a (network, not power!) cable through a door frame.
The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers |
#2
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
GMM wrote:
I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers GMM, You can get 'long series' suitable twist drills from reputable tool suppliers long enough to do what you want, or you could just grind the thread off the auger bit and stick it in an electric drill [1] keeping a fairly heavy pressure on it as you drill the hole. (A bit brutish, but this trick has often got me out of a bit of bother, and I now keep a few of the common sizes (that have been adapted that way) in the toolbox). [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Cash |
#3
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
Cash wrote:
GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers GMM, You can get 'long series' suitable twist drills from reputable tool suppliers long enough to do what you want, or you could just grind the thread off the auger bit and stick it in an electric drill [1] keeping a fairly heavy pressure on it as you drill the hole. (A bit brutish, but this trick has often got me out of a bit of bother, and I now keep a few of the common sizes (that have been adapted that way) in the toolbox). Why would you want to remove the thread off an auger bit? Just stick it in a suitably powerful mains drill and it will go straight through. Plaster might dull it a bit, but who cares? [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Tapered square? WTF is that? -- Dave - The Medway Handyman www.medwayhandyman.co.uk |
#4
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
On Sun, 12 Jul 2009 21:52:09 GMT, The Medway Handyman wrote:
Cash wrote: GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers GMM, You can get 'long series' suitable twist drills from reputable tool suppliers long enough to do what you want, or you could just grind the thread off the auger bit and stick it in an electric drill [1] keeping a fairly heavy pressure on it as you drill the hole. (A bit brutish, but this trick has often got me out of a bit of bother, and I now keep a few of the common sizes (that have been adapted that way) in the toolbox). Why would you want to remove the thread off an auger bit? Just stick it in a suitably powerful mains drill and it will go straight through. Plaster might dull it a bit, but who cares? [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Tapered square? WTF is that? All my auger bits have a square tapered section for gripping in the two jaws of a brace. SteveW |
#5
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
For the Medway Handyman!!
Steve Walker wrote: On Sun, 12 Jul 2009 21:52:09 GMT, The Medway Handyman wrote: Cash wrote: GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers GMM, You can get 'long series' suitable twist drills from reputable tool suppliers long enough to do what you want, or you could just grind the thread off the auger bit and stick it in an electric drill [1] keeping a fairly heavy pressure on it as you drill the hole. (A bit brutish, but this trick has often got me out of a bit of bother, and I now keep a few of the common sizes (that have been adapted that way) in the toolbox). Why would you want to remove the thread off an auger bit? Just stick it in a suitably powerful mains drill and it will go straight through. Plaster might dull it a bit, but who cares? The problem is that the thread will tend to 'pull' the auger in the direction that you don't want it to go - taking the thread off resolves this - sometimes "brute force and ignorance" (which seems on occasion to be your trade mark [angle grinder man]) just doesn't equate to a reasonable job! [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Tapered square? WTF is that? Now this really shows your lack of knowledge - go and have a look at an auger bit that fits into a brace (if you actually now what that is) and you will find that it is square and tapered in its length - which is totally unsuitable for fitting in any drill that only holds round stock. Now I could have been really technical and pointed him to B&Q to get an auger that has a pointy bit on one end and 6 straight sides on the other - but There We Are Then, we can't all be perfect can we? Now I now why I was fed up with reading the Life and Times of the "Grizzly Handyman" and consigned him to the darkest cave on the computer. ;-) Cash |
#6
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
Cash wrote:
For the Medway Handyman!! Steve Walker wrote: On Sun, 12 Jul 2009 21:52:09 GMT, The Medway Handyman wrote: Cash wrote: GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers GMM, You can get 'long series' suitable twist drills from reputable tool suppliers long enough to do what you want, or you could just grind the thread off the auger bit and stick it in an electric drill [1] keeping a fairly heavy pressure on it as you drill the hole. (A bit brutish, but this trick has often got me out of a bit of bother, and I now keep a few of the common sizes (that have been adapted that way) in the toolbox). Why would you want to remove the thread off an auger bit? Just stick it in a suitably powerful mains drill and it will go straight through. Plaster might dull it a bit, but who cares? The problem is that the thread will tend to 'pull' the auger in the direction that you don't want it to go - taking the thread off resolves this - sometimes "brute force and ignorance" (which seems on occasion to be your trade mark [angle grinder man]) just doesn't equate to a reasonable job! Bollox. If you can't control the pull from an auger bit & get it to go where you want, you need more Shredded Wheat. Wimp. [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Tapered square? WTF is that? Now this really shows your lack of knowledge - go and have a look at an auger bit that fits into a brace (if you actually now what that is) and you will find that it is square and tapered in its length - which is totally unsuitable for fitting in any drill that only holds round stock. Oh that tapered shank? Like Noah used to build the Ark? Its the 21st century FFS, not the middle ages. Catch up. Now I could have been really technical and pointed him to B&Q to get an auger that has a pointy bit on one end and 6 straight sides on the other - but There We Are Then, we can't all be perfect can we? Clearly not when you suggest grinding off tapers on bits last used by Barry Bucknell. Where would you find them anyway you ****? An antique shop? Things have moved on. Nobody uses a brace & bit anymore. We have power tools now. Bits are available to fit them, no need to grind them down. -- Dave - The Medway Handyman www.medwayhandyman.co.uk |
#7
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
Cash wrote:
Why would you want to remove the thread off an auger bit? Just stick it in a suitably powerful mains drill and it will go straight through. Plaster might dull it a bit, but who cares? The problem is that the thread will tend to 'pull' the auger in the direction that you don't want it to go - taking the thread off resolves Just pre drill a small hole in the timber to allow clearance around most of the worm thread - that will reduce (or eliminate if you prefer) the pull from the thread without trashing a perfectly good auger. this - sometimes "brute force and ignorance" (which seems on occasion to be your trade mark [angle grinder man]) just doesn't equate to a reasonable job! [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Tapered square? WTF is that? Now this really shows your lack of knowledge - go and have a look at an More milk tibbles? auger bit that fits into a brace (if you actually now what that is) and you will find that it is square and tapered in its length - which is totally unsuitable for fitting in any drill that only holds round stock. An angle grinder would soon fix that.... ;-) -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#8
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
On Sun, 12 Jul 2009 21:52:09 GMT, "The Medway Handyman"
had this to say: Tapered square? WTF is that? It was used for many many years to hold a bit in a carpenter's brace. It gave a positive grip, but is rarely seen nowadays - most 'bits' seem to be SDS. (Somewhere) I still have a 'tank cutter' with a tapered square shank, intended to cut (pretty obviously) a hole in a metal tank, infinitely variable from about 3/4" to 5" diameter. It has a 1/4" pilot drill (which is probably best replaced with a plain 1/4" steel spindle inserted into a hole made with a 'proper' drill!), and an adjustable radial cutter. My carpenter's brace is long defunct - ISTR that it cost 4/6d from Woolworths about 50+ years ago - actually it was very good! The posh 'ratchet' ones cost about 7/6d... -- Frank Erskine |
#9
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
Cash explained :
GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers GMM, You can get 'long series' suitable twist drills from reputable tool suppliers long enough to do what you want, or you could just grind the thread off the auger bit and stick it in an electric drill [1] keeping a fairly heavy pressure on it as you drill the hole. (A bit brutish, but this trick has often got me out of a bit of bother, and I now keep a few of the common sizes (that have been adapted that way) in the toolbox). [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Cash Not actually tried it, but could an ordinary blunt ended SDS masonry be used, but with the blunt spear end ground so it would cut into wood? -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
#10
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
Harry Bloomfield wrote:
Cash explained : GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers GMM, You can get 'long series' suitable twist drills from reputable tool suppliers long enough to do what you want, or you could just grind the thread off the auger bit and stick it in an electric drill [1] keeping a fairly heavy pressure on it as you drill the hole. (A bit brutish, but this trick has often got me out of a bit of bother, and I now keep a few of the common sizes (that have been adapted that way) in the toolbox). [1] Just make sure that you get one without the tapered square on the end - or if that is not possible, just cut the taper off. Cash Not actually tried it, but could an ordinary blunt ended SDS masonry be used, but with the blunt spear end ground so it would cut into wood? Harry, I've never tried that but I would suspect that it would tear rather than cut due to the shape of the end. I might grind an old masonry bit over the next few days and give it a go to see what happens. As a matter of interest, the Tungsten tip on a new masonry is relatively 'sharp' and may just work given a bit of pushing and a good electric drill. Cash |
#11
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
After serious thinking Cash wrote :
I've never tried that but I would suspect that it would tear rather than cut due to the shape of the end. I might grind an old masonry bit over the next few days and give it a go to see what happens. To grind it you will need a green grit wheel, but I suppose you already knew that. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
#12
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
GMM wrote:
I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Flat bit and extension bar will do what you want - just drill as far as the wood with a masonry bit, and carry on with the flat bit. Failing that, the brute force and ignorance solution would just romp through with the SDS. It may not drill the wood as such, but it won't stop it! -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#13
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
GMM wrote:
I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? One way or another, find an engineers supply store and ask for a long series twist drill, of the dimeter you need. You didn't mention what diam. hole you want to drill. The smaller the hole, the shorter the twist drill. A 3/8ths. inch long series drill will be about 12 inches long. I am not all that clear as to where the start and end of the hole will be. 1. Start of the hole will be a couple of inches away from the woodwork of a door frame. The end of the hole will be at the edge of the woodwork of the (same?) door frame. 2. Start of the hole will be a couple of inches away from the woodwork of a door frame. The end of the hole will come through the woodwork of the (same?) door frame. Either way, you will have to start drilling from the end of the hole described above and come through the plaster about 2 inches away from the door, to the start of the hole, as described above. I hope you understand that. To find out what sort of angle to drill the hole to in respect of the end to start point. Lay the twist drill on some stiff card that marks both door edges and the couple of inches away from the door and measure the angle and if you have one, set a protracter to that angle and use it as a guide when looking down on it. HTH Dave |
#14
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
"GMM" wrote in message ... I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? Cheers I have used http://www.rolsontools.com/search.asp?page=1&id=1121&tt=1&ct=1&searchCat=0&se archStock=48557 without a problem. Adam |
#15
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
"GMM" wrote in message ... I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. ..... Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? They do. http://www.drill-service.co.uk/Produ...80000&Tool=328 If those are not long enough for you, the same company will make you just about any drill you want. Colin Bignell |
#16
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
What about one of these
http://www.gb-online.co.uk/ebay/longseriesdrill.jpg I have a range of these, 12mm dia and about 20 inches long. Costs about £75 each. Cut the morse taper off, and stick it in a drill. |
#17
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
On Sun, 12 Jul 2009 14:00:41 -0700, GMM wrote:
Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? I just walked into my local DIY shed a few months ago and picked up a foot-long 3/8" drill bit off the shelf - wasn't expensive, either. Or, as network cable's flexible, you could probably drill from both sides of your frame with a shorter bit - you'll be able to get everything *almost* straight with some careful measuring and the cable will have enough give in it if it's not exactly spot-on. cheers Jules |
#18
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
In article
, GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? You can certainly get 300mm long non HSS twist drills - I have a set (5,8,10mm) bought off a market stall. I'd guess HSS might break too easily at this sort of length. Another perhaps more useful thing from the same source was 300mm extensions for flat wood bits - they have a collar which uses allen head grub screws to lock the bit in place and can be daisy chained together. Can't remember the brand - probably BlackForge or some other impressive sounding name but I'd bet Draper do something similar. Check their website. Cheers -- *Be more or less specific * Dave Plowman London SW To e-mail, change noise into sound. |
#19
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
Dave Plowman (News) wrote:
In article , GMM wrote: I need to send a (network, not power!) cable through a door frame. The plan is to go through the plaster beside the frame (a couple of inches before an adjoining door), at a bit of an angle to come out on the edge of the architrave on the other side. The total depth of this hole will be 200 - 250mm (well, 8 - 10 inches anyway) and most of it will be through timber. Soooooo....I was trying to find a drill long enough to get through that lot. Plenty of masonry jobbies to be had, SDS or not, but they're not very good on timber. The only things I can find are extended flat bits (which might be tricky to get going at the angle I need) and augur bits, which might be fine but really should be in a brace and a) I haven't got one and b) I couldn't turn a brace in that position. Why doesn't anyone sell a standard HSS/spur/multipurpose bit this kind of length? More importantly, what's the right way to do this? You can certainly get 300mm long non HSS twist drills - I have a set (5,8,10mm) bought off a market stall. I'd guess HSS might break too easily at this sort of length. To help prevent this happening, just pull the drill back out of the hole to let the saw dust out. It is the saw dust that grips the twist drill that lets the torque to go up to the twist drill's breaking point. Just drill for a maximum of 2 inches at a time and then pull out. Dave |
#20
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
In article ,
Dave wrote: You can certainly get 300mm long non HSS twist drills - I have a set (5,8,10mm) bought off a market stall. I'd guess HSS might break too easily at this sort of length. To help prevent this happening, just pull the drill back out of the hole to let the saw dust out. It is the saw dust that grips the twist drill that lets the torque to go up to the twist drill's breaking point. Just drill for a maximum of 2 inches at a time and then pull out. I was thinking more of bending type breaking than twisting with a very long smallish HSS. -- *In "Casablanca", Humphrey Bogart never said "Play it again, Sam" * Dave Plowman London SW To e-mail, change noise into sound. |
#21
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
Dave Plowman (News) wrote:
In article , Dave wrote: You can certainly get 300mm long non HSS twist drills - I have a set (5,8,10mm) bought off a market stall. I'd guess HSS might break too easily at this sort of length. To help prevent this happening, just pull the drill back out of the hole to let the saw dust out. It is the saw dust that grips the twist drill that lets the torque to go up to the twist drill's breaking point. Just drill for a maximum of 2 inches at a time and then pull out. I was thinking more of bending type breaking than twisting with a very long smallish HSS. I see what you mean. This is a common problem with a pistol type drill handle. The way to get round this, if you are right handed. (If you are left handed, just change hands and follow this with your left hand doing the pushing.)... In your normal way, start the hole off. Now stop drilling and change hands. Hold the pistol grip in your left hand with only your first finger and thumb, using your finger to press the start switch, while you press at the back of the body of the drill with only the palm of your hand, directly behind and in line with the chuck to start cutting the hole. Do not use your fingers at all while pushing. This puts all the pressure along the line of the twist drill. It is the act of holding the pistol grip with your full hand grip that puts a bend in the twist drill, as the pressure is put on the drill below the axis of the twist drill. I'm sure that you knew this Dave, but it is surprising how many drills are snapped by holding and pressing with the handle of the drill. Dave |
#22
Posted to uk.d-i-y
|
|||
|
|||
Drilling a long hole in timber
In article ,
Dave wrote: I was thinking more of bending type breaking than twisting with a very long smallish HSS. I see what you mean. This is a common problem with a pistol type drill handle. The way to get round this, if you are right handed. (If you are left handed, just change hands and follow this with your left hand doing the pushing.)... [Snip] I hardly ever use HSS drills in a hand drill - I have a drill press which would be used for steel, etc. -- *If a parsley farmer is sued, can they garnish his wages? Dave Plowman London SW To e-mail, change noise into sound. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Drilling long hole through wood | UK diy |