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
|
|||
|
|||
Why 5.5mm Sds drill bit?
Hi
I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? David |
#2
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
|
#3
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
Andy Burns writes: wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" In many materials, SDS bits end up with a wider hole than the same size non-SDS bit. With SDS, I will almost always use a smaller bit than I would have with a plain hammer drill. If the hole is too tight, I will then widen it with the next bit size up, but not operating in hammer mode. This gives a cleaner and stronger hole for supporting rawl plugs. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#4
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
"Andrew Gabriel" wrote in message
... In article , Andy Burns writes: wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" In many materials, SDS bits end up with a wider hole than the same size non-SDS bit. That's what the brown rawl plugs are for;-) -- Adam |
#5
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article , Andrew Gabriel
writes In article , Andy Burns writes: wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" In many materials, SDS bits end up with a wider hole than the same size non-SDS bit. With SDS, I will almost always use a smaller bit than I would have with a plain hammer drill. If the hole is too tight, I will then widen it with the next bit size up, but not operating in hammer mode. This gives a cleaner and stronger hole for supporting rawl plugs. I always use a pilot hole, more so for old school hammer drilling than SDS as the former will more likely take longer and so has a greater chance to wander. It's mainly (soft) sandstone here so it makes sense to drill a pilot and then give it a single run down with the right size bit. Despite my favourite plugs 'requiring' a 7mm bit, I don't own one but know just how much wiggle to apply to turn a 6 into a 7. -- fred it's a ba-na-na . . . . |
#6
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On Tue, 28 Oct 2014 21:01:58 +0000
fred wrote: In article , Andrew Gabriel writes In article , Andy Burns writes: wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" In many materials, SDS bits end up with a wider hole than the same size non-SDS bit. With SDS, I will almost always use a smaller bit than I would have with a plain hammer drill. If the hole is too tight, I will then widen it with the next bit size up, but not operating in hammer mode. This gives a cleaner and stronger hole for supporting rawl plugs. I always use a pilot hole, more so for old school hammer drilling than SDS as the former will more likely take longer and so has a greater chance to wander. It's mainly (soft) sandstone here so it makes sense to drill a pilot and then give it a single run down with the right size bit. Despite my favourite plugs 'requiring' a 7mm bit, I don't own one but know just how much wiggle to apply to turn a 6 into a 7. I wanted a 7mm bit the other day, and the newly-opened hardware shop in town didn't have one. Their supplier listed .....5.0, 5.5, 6.0, 8.0, ...... Needless to say, I went to the builder's merchant over the road, and bought what I needed. -- Davey. |
#7
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On Tuesday, October 28, 2014 6:40:35 PM UTC, Andrew Gabriel wrote:
In article , Andy Burns writes: wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" In many materials, SDS bits end up with a wider hole than the same size non-SDS bit. With SDS, I will almost always use a smaller bit than I would have with a plain hammer drill. If the hole is too tight, I will then widen it with the next bit size up, but not operating in hammer mode. This gives a cleaner and stronger hole for supporting rawl plugs. +1. If its then not tight enough, stick a match in the plug. NT |
#9
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On 28 Oct 2014, Andy Burns grunted:
wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" My yellow plugs say "5/5.5 mm" and I do tend to use both, depending on substrate generally. -- David |
#10
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
Lobster wrote:
On 28 Oct 2014, Andy Burns grunted: wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" My yellow plugs say "5/5.5 mm" and I do tend to use both, depending on substrate generally. I have some 4mm and 4.5mm SDS bits which I find *very* useful for yellow plugs to get a nice tight fit. It's very rarely I find that I actually need to run a 5mm into the hole to get a yellow plug in. -- Chris Green · |
#11
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
Andy Burns wrote:
wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" I have to hand some "Woodworkers" brand that say 5.5 mm and some Rawl brand that say 6 mm. -- Mike Barnes Cheshire, England |
#12
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On 28/10/2014 18:34, Andy Burns wrote:
wrote: I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? I think 5.5mm is the 'official' size for red rawlplugs, probably originally from 7/32" yep .. most of my plugs take 5.5 ... though I will often drill out at 5.0 to allow for usual loose hole that results. |
#13
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
wrote in message ... Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? David Flexibility? As 5mm and 6mm are the probably most popular sizes an intermediate size offers the possibility of using a 6mm plug with a thinner but longer screw which would be too long for a standard 5mm plug. So it offers more purchase on the actual plug. Also if the walls are a bit on the ropey side I've often found it can be a help to use bits which are a bit undersize in any case. The eventual size of the holes is another matter. michael adams .... |
#14
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
|
#15
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On 28/10/2014 19:35, Roger Mills wrote:
On 28/10/2014 18:27, wrote: Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? David It's my drill of choice when drilling holes in most materials for red rawlplugs. I only use 6mm if drilling into something very hard - concrete or engineering bricks. I get a much firmer fixing that way. +1 In softer substrates an SDS bit will tend to make a slightly larger hole. I always use a 5.5 drill bit for a red rawlplug. In harder maretials a hammer is needed to insert the plug (4.. screw) Malcolm |
#16
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On 28/10/2014 23:10, Malcolm Race wrote:
On 28/10/2014 19:35, Roger Mills wrote: On 28/10/2014 18:27, wrote: Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? David It's my drill of choice when drilling holes in most materials for red rawlplugs. I only use 6mm if drilling into something very hard - concrete or engineering bricks. I get a much firmer fixing that way. +1 In softer substrates an SDS bit will tend to make a slightly larger hole. I always use a 5.5 drill bit for a red rawlplug. In harder maretials a hammer is needed to insert the plug (4.. screw) Malcolm I find that with 5.5 in harder materials, plastic plugs often buckle when you try to hammer them in. That's when I use 6mm instead. -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. |
#17
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
Roger Mills wrote:
On 28/10/2014 18:27, wrote: Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? David It's my drill of choice when drilling holes in most materials for red rawlplugs. I only use 6mm if drilling into something very hard - concrete or engineering bricks. I get a much firmer fixing that way. Yes, I find the 'recommended' drill sizes for plugs are nearly always too generous. I'm happiest when I just have to tap the plug in gently with a hammer (or something else when I've not got a hammer!). -- Chris Green · |
#18
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
|
#19
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On 29/10/2014 07:32, Mike Barnes wrote:
wrote: I find the 'recommended' drill sizes for plugs are nearly always too generous. I'm happiest when I just have to tap the plug in gently with a hammer (or something else when I've not got a hammer!). I often use the back of the drill. +1 :-) -- Dave - The Medway Handyman www.medwayhandyman.co.uk |
#20
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
wrote: Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? It's the 'old' Number 10. -- *A bartender is just a pharmacist with a limited inventory. Dave Plowman London SW To e-mail, change noise into sound. |
#21
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
wrote in message ... Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? There is a unique problem to SDS bits. When the front of the bit goes blunt (esp the small sized), it still drills fine with the SDS drill (though and ordinary pistol drill wouldn't make any hole with it.) But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. This can be a problem you can't resolve by sharpening. So you end up using the worn drills for the "next size down". |
#22
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
harryagain wrote: There is a unique problem to SDS bits. When the front of the bit goes blunt (esp the small sized), it still drills fine with the SDS drill (though and ordinary pistol drill wouldn't make any hole with it.) You use SDS bits in an 'ordinary pistol drill'? But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. All the masonry bits I've seen have a much wider tip than shank. This can be a problem you can't resolve by sharpening. So you end up using the worn drills for the "next size down". Or simply buy a new one? SDS drills tend to have a very long life. -- *Elephants are the only mammals that can't jump * Dave Plowman London SW To e-mail, change noise into sound. |
#23
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
Dave Plowman (News) wrote: In article , harryagain wrote: There is a unique problem to SDS bits. When the front of the bit goes blunt (esp the small sized), it still drills fine with the SDS drill (though and ordinary pistol drill wouldn't make any hole with it.) You use SDS bits in an 'ordinary pistol drill'? But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. All the masonry bits I've seen have a much wider tip than shank. This can be a problem you can't resolve by sharpening. So you end up using the worn drills for the "next size down". Or simply buy a new one? SDS drills tend to have a very long life. but when you meet a reinforcing rod in a concrete beam, they don't like it. -- From KT24 Using a RISC OS computer running v5.18 |
#24
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
charles writes: but when you meet a reinforcing rod in a concrete beam, they don't like it. IME, they go straight through rebar without hesitation. That's not necessarly a good thing - many pre-stressed concrete lintels only have one rebar in them in the first place. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#25
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
Andrew Gabriel wrote: In article , charles writes: but when you meet a reinforcing rod in a concrete beam, they don't like it. IME, they go straight through rebar without hesitation. That's not necessarly a good thing - many pre-stressed concrete lintels only have one rebar in them in the first place. oh, I agree they go through, but they aren't much good on brickwork afterwards. -- From KT24 Using a RISC OS computer running v5.18 |
#26
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On 29/10/2014 08:26, harryagain wrote:
wrote in message ... Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? There is a unique problem to SDS bits. When the front of the bit goes blunt (esp the small sized), it still drills fine with the SDS drill (though and ordinary pistol drill wouldn't make any hole with it.) But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. Utter cobblers. The spiral 'side' of the bit only clears the waste, the tip makes the hole. I've never had an SDS bit go blunt, despite drill thousands of holes a year. -- Dave - The Medway Handyman www.medwayhandyman.co.uk |
#27
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
"The Medway Handyman" wrote in message
news On 29/10/2014 08:26, harryagain wrote: wrote in message ... Hi I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? There is a unique problem to SDS bits. When the front of the bit goes blunt (esp the small sized), it still drills fine with the SDS drill (though and ordinary pistol drill wouldn't make any hole with it.) But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. Utter cobblers. The spiral 'side' of the bit only clears the waste, the tip makes the hole. I've never had an SDS bit go blunt, despite drill thousands of holes a year. Dave, I wish that my larger SDS bits were as long lasting as yours seem to be. I have a box of 20 mm to 35 mm sds drill bits that have been used many times on re-inforced concrete and are decidedly smooth where they should be sharp Sharpening is easy enough on a diamond or green grit wheel but it's one of many 'round-tuit' jobs ! I agree with your comment about the spiral having no part in the cutting - I have some that are amazingly wasted down ! Andrew |
#28
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
The Medway Handyman wrote: I've never had an SDS bit go blunt, despite drill thousands of holes a year. I'd agree - although they don't get anything like your sort of use here. Ordinary masonry bits in a hammer drill were a different matter. -- *Hard work pays off in the future. Laziness pays off now * Dave Plowman London SW To e-mail, change noise into sound. |
#29
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
The Medway Handyman wrote:
I've never had an SDS bit go blunt, despite drill thousands of holes a year. IKWYM but I'd say they do go blunt. But they still work well enough when blunt, in a way that simple twist bits and masonry bits don't. -- Mike Barnes Cheshire, England |
#30
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article ,
Mike Barnes wrote: The Medway Handyman wrote: I've never had an SDS bit go blunt, despite drill thousands of holes a year. IKWYM but I'd say they do go blunt. But they still work well enough when blunt, in a way that simple twist bits and masonry bits don't. It's very easy to check for wear on the tip. And it takes a lot of use before it shows - although obviously depending on what you're drilling. -- *Cover me. I'm changing lanes. Dave Plowman London SW To e-mail, change noise into sound. |
#31
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On Fri, 31 Oct 2014 08:43:17 +0000, The Medway Handyman
wrote: But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. Utter cobblers. The spiral 'side' of the bit only clears the waste, the tip makes the hole. I've never had an SDS bit go blunt, despite drill thousands of holes a year. You must have one of the fabled everlasting drill bits, then. I keep getting the ones that eventually wear - and I've also drilled thousands of holes with them. |
#32
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On 13/11/2014 13:40, Grimly Curmudgeon wrote:
On Fri, 31 Oct 2014 08:43:17 +0000, The Medway Handyman wrote: But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. Utter cobblers. The spiral 'side' of the bit only clears the waste, the tip makes the hole. I've never had an SDS bit go blunt, despite drill thousands of holes a year. You must have one of the fabled everlasting drill bits, then. I keep getting the ones that eventually wear - and I've also drilled thousands of holes with them. I suppose it depends to a great extent on what you are drilling into. When I moved to my current address in 1978 my trusty hammer drill would take 10 minutes or more to drill a hole for a wall plug in the stone walls even assuming the masonry drill stood up to the punishment. SDS of course is a different ball game but the drill bits tend not to last. I don't actually count the number of holes I drill but I suspect that my drills last for 100s of holes rather than 1000s. And if you can drill a small diameter hole in a few seconds you do tend to drill far more holes than you would if almost every hole was an epic as used to be the case. -- Roger Chapman |
#33
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
In article , Roger Chapman
wrote: On 13/11/2014 13:40, Grimly Curmudgeon wrote: On Fri, 31 Oct 2014 08:43:17 +0000, The Medway Handyman wrote: But as the side of the drill also wear, you get undersized holes, sometimes greatly undersized. Utter cobblers. The spiral 'side' of the bit only clears the waste, the tip makes the hole. I've never had an SDS bit go blunt, despite drill thousands of holes a year. You must have one of the fabled everlasting drill bits, then. I keep getting the ones that eventually wear - and I've also drilled thousands of holes with them. I suppose it depends to a great extent on what you are drilling into. When I moved to my current address in 1978 my trusty hammer drill would take 10 minutes or more to drill a hole for a wall plug in the stone walls even assuming the masonry drill stood up to the punishment. and before masonry drills we had to use a Rawltool! -- From KT24 Using a RISC OS computer running v5.18 |
#34
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On Thu, 13 Nov 2014 14:06:02 +0000, Roger Chapman
wrote: You must have one of the fabled everlasting drill bits, then. I keep getting the ones that eventually wear - and I've also drilled thousands of holes with them. I suppose it depends to a great extent on what you are drilling into. When I moved to my current address in 1978 my trusty hammer drill would take 10 minutes or more to drill a hole for a wall plug in the stone walls even assuming the masonry drill stood up to the punishment. SDS of course is a different ball game but the drill bits tend not to last. I don't actually count the number of holes I drill but I suspect that my drills last for 100s of holes rather than 1000s. And if you can drill a small diameter hole in a few seconds you do tend to drill far more holes than you would if almost every hole was an epic as used to be the case. I lost a 14mm SDS bit the other day. It went in and jammed solid and as it was at the top of a section of ladder I wasn't in a position to get decent access or leverage on it. Fortunately the hole wasn't a vital one-off position, so a new hole got drilled below it and the first new proper application of my new AG took place on the stuck bit. |
#35
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On Tue, 28 Oct 2014 11:27:33 -0700 (PDT),
wrote: I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? For the slightly smaller 5.5mm frame fixers that sparks commonly use to bosh in wiring boxes with. |
#36
Posted to uk.d-i-y
|
|||
|
|||
Why 5.5mm Sds drill bit?
On Friday, October 31, 2014 1:56:16 AM UTC, Grimly Curmudgeon wrote:
On Tue, 28 Oct 2014 11:27:33 -0700 (PDT), wrote: I have often used 5mm and 6mm non-SDS drill bits for rawl plug holes. I am thinking of buying a set of SDS drill bits and have noticed that sets usually include a 5.5mm bit. What is the reason for this size? For the slightly smaller 5.5mm frame fixers that sparks commonly use to bosh in wiring boxes with. Axminster recommend 5.5mm bits for their red wall plugs |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
drill bit,drill rod,core barrel,core drilling tools, drill tube, DTH hammer and bit, drag bit, thread bit, taper bit,taper rod,integral drill rod,drill steel, button bit, shank adapter,extension rod, speed rod, rock drill, handheld ,pneumatic, motor- | Home Ownership | |||
Drill tube, drill rod, drill bit, rock bit, reamer and DTH hammer | Woodturning | |||
Drill tube, drill rod, drill bit, rock bit, reamer and DTH hammer | Woodturning | |||
Drill pipe, drill rod, drill bit, rock bit, reamer and DTH hammer | Woodturning | |||
Drill pipe, drill rod, drill bit, rock bit, reamer and DTH hammer | Woodturning |