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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. |
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#1
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Is this drill working properly? Makita 8391
I bought this drill...
http://www.screwfix.com/prods/83834/...-Accessory-Kit (but for £100 - don't know why Screwfix made that price up!) I'm concerned the clutch (or whatever it is that lets the drive slip) isn't quite right. On the screw driver setting, even at the _highest_ torque setting, I can stop the shaft turning just by holding the chuck with my hand. On the drill setting, the clutch has no effect (i.e. the drill turns unless it can't - it doesn't intentionally slip). The gap between highest torque and no slip seems ridiculously large. I was using one of the hex bits to drive a bolt into a wall, and it didn't go in at all on the screw driver setting. It went in fine on the drill setting, but then nearly broke something at the end. On both my previous drills, the top setting was far far stronger. On a cordless I borrowed there was still a slightly annoying gap between the top setting and the "drill" setting - but nothing like this! On my old mains drill, the range was continuous, which was ideal. Is this new drill faulty, or is it a design fault, or is it just crap? It's possible, when changing gears or direction, to get the clutch stuck "open", but that's not what I'm talking about here. Even when it seems to be engaged, it doesn't seem to be as strong as I'd like. The batteries don't seem to be that great. I posted a thread on here a few weeks back asking about cordless vs mains. As I drilled a 15mm bit through stone at the weekend, I was wishing for a mains drill - the cordless got through in the end, but it was so slow and kept stopping completely when the bit caught. (There wasn't quite room for my SDS). I thought the batteries were getting flat, but swapping to a freshly charged one only improved things for a few seconds. Cheers, David. |
#2
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Is this drill working properly? Makita 8391
On Nov 22, 2:10 pm, David Robinson
wrote: I bought this drill... http://www.screwfix.com/prods/83834/...s-Drills/Makit... (but for £100 - don't know why Screwfix made that price up!) I'm concerned the clutch (or whatever it is that lets the drive slip) isn't quite right. On the screw driver setting, even at the _highest_ torque setting, I can stop the shaft turning just by holding the chuck with my hand. On the drill setting, the clutch has no effect (i.e. the drill turns unless it can't - it doesn't intentionally slip). The gap between highest torque and no slip seems ridiculously large. I was using one of the hex bits to drive a bolt into a wall, and it didn't go in at all on the screw driver setting. It went in fine on the drill setting, but then nearly broke something at the end. On both my previous drills, the top setting was far far stronger. On a cordless I borrowed there was still a slightly annoying gap between the top setting and the "drill" setting - but nothing like this! On my old mains drill, the range was continuous, which was ideal. Is this new drill faulty, or is it a design fault, or is it just crap? It's possible, when changing gears or direction, to get the clutch stuck "open", but that's not what I'm talking about here. Even when it seems to be engaged, it doesn't seem to be as strong as I'd like. The batteries don't seem to be that great. I posted a thread on here a few weeks back asking about cordless vs mains. As I drilled a 15mm bit through stone at the weekend, I was wishing for a mains drill - the cordless got through in the end, but it was so slow and kept stopping completely when the bit caught. (There wasn't quite room for my SDS). I thought the batteries were getting flat, but swapping to a freshly charged one only improved things for a few seconds. Cheers, David. suspect a 15mm masonry bit was pushing the envelope for a 18v combi !!! similarly re torque settings - remember they are designed for screwing *screws* without snapping them - your hex head bolt sounds somewhat more "torque hungry" than a woodscrew?;) You could try it with a mains drill - and prepare yourself for the snapping sensation and the fun of extracting the broken bolt out so you can have another go.... perhaps lower your expectations a bit for £100 & battery power? Jim K |
#3
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Is this drill working properly? Makita 8391
On Nov 22, 2:10*pm, David Robinson
wrote: I'm concerned the clutch (or whatever it is that lets the drive slip) isn't quite right. On the screw driver setting, even at the _highest_ torque setting, I can stop the shaft turning just by holding the chuck with my hand. It certainly doesn't sound right. On my Bosch 24v cordless, of similar price, there's no way you could slip the clutch with your hand on the highest setting. That probably doesn't help you directly but it may add some support for your expectations not being unreasonable. Mathew |
#4
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Is this drill working properly? Makita 8391
Mathew Newton wrote:
On Nov 22, 2:10 pm, David Robinson wrote: I'm concerned the clutch (or whatever it is that lets the drive slip) isn't quite right. On the screw driver setting, even at the _highest_ torque setting, I can stop the shaft turning just by holding the chuck with my hand. It certainly doesn't sound right. On my Bosch 24v cordless, of similar price, there's no way you could slip the clutch with your hand on the highest setting. That probably doesn't help you directly but it may add some support for your expectations not being unreasonable. My 14.4v Makita couldn't be stopped on the highest torque setting - no way - unless the battery is flat. Are you sure the batteries are charged properly? Sometimes with Makita chargers, if you insert a flatish battery the green light remains on & it won't charge. Unplug charger, remove battery, plug back in, insert battery & check the red light comes on. -- Dave - The Medway Handyman www.medwayhandyman.co.uk |
#5
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Is this drill working properly? Makita 8391
David wrote...
On the screw driver setting, even at the _highest_ torque setting, I can stop the shaft turning just by holding the chuck with my hand. That is broken or at least not good enough, or you may have it on the highest speed which allows momentum to build to overrun the clutch. For screwdriving you should use speed #1 (at least for plasterboard, cement board, rubbishy pine). I have a Makita 14.4V 6337D. I actually bought the body (£32), NiMH battery (£40), multi-charger (£19) as odds-n-sods on Ebay as I disposed of other stuff. It is a Marathon motor drill which does mean it has very torque, and uses NiMH (or NiCad) batteries. It is a 2-speed drill and not a combi drill like the MXT Combi which is about £45-55 for the body even on Ebay (and heavier). Set to screws, gearbox speed 1. With clutch set to 5 it can be stopped with a firm grip, albeit giving your wrist a good snatch. With clutch set to 16 you can forget stopping it, it will actually break your wrist before you can get the trigger fully down. The downside is under part-speed, very high resistance, the speed control can smoke and fail. I suspect that may be the run-in NiMH battery. So I have a "no speed control" for brickwork and a "do not abuse" for precise (cough!) woodwork. Makita would not entertain the warranty because I had bought on Ebay, no point shipping it around and just bought a replacement 6337D body for £27 delivered in the recession. Now, when I tried 12V non-marathon & 14.4V non-marathon with NiCad I did find them weedy - even compared to an old 9.6V NiCad which I suspect re 1998-2000 had a "marathon motor or its equivalent back them". Batteries do take time to run-in and achieve a full charge, but I find 1.3Ah is that bit too small - 1.5Ah is noticeably better in that you can actually finish a job without finding the thing grinds to a halt. On the NiMH you have almost consistent fresh-charge power until the last 20secs, it really is that good. The downside is the self discharge is pretty dire. If you do not need a Combi, buy a non-Combi cordless with occasional masonry (Bosch Multiconstruction bit) and a proper mains SDS for masonry because nothing matches it except the expensive cordless SDS drills (£200+). |
#6
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Is this drill working properly? Makita 8391
On Nov 22, 2:44*pm, "js.b1" wrote:
David wrote... On the screw driver setting, even at the _highest_ torque setting, I can stop the shaft turning just by holding the chuck with my hand. That is broken or at least not good enough, or you may have it on the highest speed which allows momentum to build to overrun the clutch. For screwdriving you should use speed #1 (at least for plasterboard, cement board, rubbishy pine). Yes, it was on 1. It didn't make much difference (except when the clutch didn't engage at all and it slipped completely). I have a Makita 14.4V 6337D. I actually bought the body (£32), NiMH battery (£40), multi-charger (£19) as odds-n-sods on Ebay as I disposed of other stuff. It is a Marathon motor drill which does mean it has very torque, and uses NiMH (or NiCad) batteries. It is a 2-speed drill and not a combi drill like the MXT Combi which is about £45-55 for the body even on Ebay (and heavier). Set to screws, gearbox speed 1. With clutch set to 5 it can be stopped with a firm grip, albeit giving your wrist a good snatch. With clutch set to 16 you can forget stopping it, it will actually break your wrist before you can get the trigger fully down. This is what I would expect! I just phoned Makita to ask. The guy in the service department claimed that he could stop all their tools with his hand in screwdriver mode - it's just that some took more effort than others. ???? He asked what I was trying to do. I said 3" No. 10 screws into 4x2 (which I've tried, and it gives up). He said drill a proper pilot hole. He pointed out that this only has 40Nm of torque, while the better model has 80Nm. But this is torque in drill mode - he couldn't say if it made any difference to the max torque in screw driver mode. He seemed to think I was a bit mad switching to drill mode to finish off the screw driving - me too, but I've rarely needed to before! I was thinking that maybe I'd keep the cordless as a glorified screw driver, and get a mains drill for heavier jobs - but this one doesn't work as a glorified screw driver, so I think it's going to have to go back. :-( btw, I really liked the keyless chuck. Far more convenient than any keyed chuck I've had, and it didn't slip - whereas a keyed chuck did in the same circumstances (though due to the lack of power the keyless didn't get thrashed as much, so it's not a totally fair comparison). If you do not need a Combi, buy a non-Combi cordless with occasional masonry (Bosch Multiconstruction bit) and a proper mains SDS for masonry because nothing matches it except the expensive cordless SDS drills (£200+). I think you're right - though there are times when a normal hammer drill seems like the right thing to use and SDS seems like overkill. Cheers, David. |
#7
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Is this drill working properly? Makita 8391
David Robinson wrote:
On Nov 22, 2:44 pm, "js.b1" wrote: With clutch set to 16 you can forget stopping it, it will actually break your wrist before you can get the trigger fully down. This is what I would expect! I just phoned Makita to ask. The guy in the service department claimed that he could stop all their tools with his hand in screwdriver mode - it's just that some took more effort than others. Send it back, it's broken. |
#8
Posted to uk.d-i-y
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Is this drill working properly? Makita 8391
On 22/11/2010 14:10, David Robinson wrote:
I bought this drill... http://www.screwfix.com/prods/83834/...-Accessory-Kit (but for £100 - don't know why Screwfix made that price up!) I'm concerned the clutch (or whatever it is that lets the drive slip) isn't quite right. On the screw driver setting, even at the _highest_ torque setting, I can stop the shaft turning just by holding the chuck with my hand. On the drill setting, the clutch has no effect (i.e. the drill turns unless it can't - it doesn't intentionally slip). The gap between highest torque and no slip seems ridiculously large. I was using one of the hex bits to drive a bolt into a wall, and it didn't go in at all on the screw driver setting. It went in fine on the drill setting, but then nearly broke something at the end. On both my previous drills, the top setting was far far stronger. On a cordless I borrowed there was still a slightly annoying gap between the top setting and the "drill" setting - but nothing like this! On my old mains drill, the range was continuous, which was ideal. Is this new drill faulty, or is it a design fault, or is it just crap? It's possible, when changing gears or direction, to get the clutch stuck "open", but that's not what I'm talking about here. Even when it seems to be engaged, it doesn't seem to be as strong as I'd like. The batteries don't seem to be that great. I posted a thread on here a few weeks back asking about cordless vs mains. As I drilled a 15mm bit through stone at the weekend, I was wishing for a mains drill - the cordless got through in the end, but it was so slow and kept stopping completely when the bit caught. (There wasn't quite room for my SDS). I thought the batteries were getting flat, but swapping to a freshly charged one only improved things for a few seconds. Cheers, David. I've one two of these http://www.lawson-his.co.uk/scripts/...&product=36503 and there's no way you can stop the chuck turning when the torque setting is set to maximum. |
#9
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Is this drill working properly? Makita 8391
I've one two of these http://www.lawson-his.co.uk/scripts/...&product=36503 and there's no way you can stop the chuck turning when the torque setting is set to maximum. Never realised Makita was made in the UK until I saw that ad.... |
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