drill speed reducer

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drill speed reducer

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  • #23616
    lee hawkins 1
    Participant
      @leehawkins1
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      #172017
      lee hawkins 1
      Participant
        @leehawkins1

        Hello all

        Has anybody ever used one of these, **LINK**

        How robust or should I say strong are they, I want to cut 4 holes at 65mm dia, with a hole saw in 1/4 -1/2 inch mild steel plate, the drill I have is a Wolf big old 2 speed heavy duty drill, ,one of the old type that dont give in, but the speed on lowest setting is 430rpm, I sort of think this is still too fast?

        Thanks

        lee

        #172020
        Nick_G
        Participant
          @nick_g
          Posted by lee hawkins 1 on 09/12/2014 12:25:09:

          I want to cut 4 holes at 65mm dia, with a hole saw in 1/4 -1/2 inch mild steel plate, the drill I have is a Wolf big old 2 speed heavy duty drill, ,one of the old type that dont give in

          As a ex electrician I have spent a fair bit of time with hole saws of various sizes chucked in drills. I am also familiar with those beefy Woof drills.

          Are you thinking of using the drill hand held.? surprise Because if you are, with a saw of that size in that thickness of plate I fear the only thing you will achieve is a broken wrist.

          Nick

          #172021
          JasonB
          Moderator
            @jasonb

            Not known as "gut busters" without good reason.

            My dad always tells the story of how as a sparks in the 50s he would often have to drill steel tanks with a brace & bit.

            Better to see if you can borrow a modern SDS+ drill with the hammer switched off the clutch will save you hurting yourself and the vari speed will take care of the rest.

            J

            #172023
            Nigel Bennett
            Participant
              @nigelbennett69913

              I had one – a Rawlplug model. I made up a big aluminium shroud and handle for it so that I could get a decent grip on it when in use. It got used for drilling a lot of holes in the floors of Class 442 EMUs down at Bournemouth railway depot and it eventually wore out, having had a very hard life indeed. It was an excellent piece of kit.

              #172024
              lee hawkins 1
              Participant
                @leehawkins1

                Hello Nick

                No,

                I will not be trying to hold the drill in my hands, did all that sort of stuff years ago when we had not alot of choice really, na wont be doing that no more

                No it will be securely fixed in a beefy drill stand

                lee

                #172026
                Bazyle
                Participant
                  @bazyle

                  What kind of hole saw is going to tackle 1/2 in plate? All the ones I've seen are for very thin metal or brick.

                  BTW a regular drill on a speed reducer is going to overheat unless you give it some long periods of running off load fast to give the fan a chance to move some air.

                  #172027
                  Michael Gilligan
                  Participant
                    @michaelgilligan61133

                    Lee,

                    To be honest, I don't think that speed-reducer stands a chance of doing the job you mention.

                    1/4" shank, driving a compact epicyclic unit no

                    O.K. for sheet metal or GRP sheet, but it would be better to use a more suitable Drill. an electronic speed controller on the big Wolf.

                    MichaelG.

                    .

                    Edit: Just realised that you already have the Drill. blush

                    Edited By Michael Gilligan on 09/12/2014 13:04:14

                    #172031
                    lee hawkins 1
                    Participant
                      @leehawkins1

                      I know the torque of my, drill will chew through the steel plate quite easily, but I also know from past experience if the speed is too fast it messes up the hole saws teeth, I use Starrett hole saws which are brilliant for this job but they must be run slower, I contacted somebody who sells electronic moter speed controlers, but he said the ones he sells only reduces the voltage, I would get the speed down but Lose the torque

                      I have a top line so say heavy duty Matabo drill, but it heats up, light comes on and I cannot carry on till the light goes out,

                      thanks

                      lee

                      Edited By lee hawkins 1 on 09/12/2014 13:26:59

                      #172032
                      JOHN KNIGHT
                      Participant
                        @johnknight56112

                        I tried to use a speed reducer in conjunction with a pillar drill and a 50mm hole saw. I found that I could not hold the outer of the reducer – hence no drive to the hole saw.

                        regards

                        John

                        #172034
                        lee hawkins 1
                        Participant
                          @leehawkins1
                          Posted by JOHN KNIGHT on 09/12/2014 13:26:02:

                          I tried to use a speed reducer in conjunction with a pillar drill and a 50mm hole saw. I found that I could not hold the outer of the reducer – hence no drive to the hole saw.

                          regards

                          John

                          Ok so it does not work anyway then

                          Thanks for posting

                          #172039
                          David Colwill
                          Participant
                            @davidcolwill19261

                            Could you borrow a magnetic drill, that would be the tool for the job.

                            Regards.

                            David.

                            #172040
                            Neil Wyatt
                            Moderator
                              @neilwyatt

                              Don't they normally have a tapped hole in for a torque reaction bar that can lodge against the drill pillar?

                              Neil

                              #172048
                              lee hawkins 1
                              Participant
                                @leehawkins1

                                I did think about buying a mag drill, too pricey for me though,

                                I'll sort out some way to do it ,

                                #172050
                                clogs
                                Participant
                                  @clogs

                                  Hi Lee,

                                  mag drills are def the way 2 go…..they don't cost the earth 2 rent……plus a transformer..(all the modern one are 110v)

                                  I bought mine as I got fed up with the worn out rentals or "it's out mate"….. it will cut the hole but u def need a sharp cutter…..if u go the rental route, shop about, some require u 2 buy ur own cutter £60-80 plus on flebay……other's just charge u for a re-grind on their's…remember loads of cutting fluid…..

                                  Frank

                                  #172053
                                  Muzzer
                                  Participant
                                    @muzzer

                                    Can you fit it in the lathe (in the gap), with the saw in the spindle? That way you'd have coolant and the right speed, both of which you need. The teeth on those hole saws are very fine and fill up with swarf very quickly so you need to do more pecking than a nervous hen(?), clearing the teeth out with a brush as you go.

                                    I had some success notching pipes this way (with the pipes clamped to a vice in the top slide) and having used a hole saw on some 1/4" plate in the drill press, I'd be tempted to use the lathe next time if I didn't have a decent mill with a back gear and coolant.

                                    Murray

                                    #172060
                                    Enough!
                                    Participant
                                      @enough
                                      Posted by lee hawkins 1 on 09/12/2014 13:24:55:

                                      I know the torque of my, drill will chew through the steel plate quite easily,

                                      Maybe I'm not adventurous enough but I wouldn't attempt to go through 1/2" steel with a hole-saw even on my 3/4 HP pillar drill on its slowest speed.

                                      Apart from all else I would expect it to take literally hours given that a hole saw is one of the worst configurations of cutting tool since that there's no route for swarf removal and you have to withdraw it every few seconds. If you are the least bit tardy on that, it heats up with loss of cutting edge and the swarf welds itself to the blade making it even more difficult and time-consuming to remove.

                                      I'd be very interested to hear how you get on.

                                      Edited By Bandersnatch on 09/12/2014 18:23:37

                                      #172062
                                      lee hawkins 1
                                      Participant
                                        @leehawkins1

                                        Murray

                                        I have not got a lathe, the holes in the steel Plate are for parts that will make up the legs of a lathe i am building,

                                        This is why I am reluctant to fork out money for a Mag drill, ,want to save it for the lathe build,

                                        I do have a home built milling machine would have done the job, that was working brilliantly until the shaft coupling snapped, I cant repaiir that yet, I bought two shaft couplings when I built the mill,left one of them around my brothers garage, but he is out of the country, wont be back for another month

                                        thanks

                                        lee

                                        #172066
                                        lee hawkins 1
                                        Participant
                                          @leehawkins1
                                          Posted by Bandersnatch on 09/12/2014 18:23:05:

                                          Posted by lee hawkins 1 on 09/12/2014 13:24:55:

                                          I know the torque of my, drill will chew through the steel plate quite easily,

                                          Maybe I'm not adventurous enough but I wouldn't attempt to go through 1/2" steel with a hole-saw even on my 3/4 HP pillar drill on its slowest speed.

                                          Apart from all else I would expect it to take literally hours given that a hole saw is one of the worst configurations of cutting tool since that there's no route for swarf removal and you have to withdraw it every few seconds. If you are the least bit tardy on that, it heats up with loss of cutting edge and the swarf welds itself to the blade making it even more difficult and time-consuming to remove.

                                          I'd be very interested to hear how you get on.

                                          Edited By Bandersnatch on 09/12/2014 18:23:37

                                          3/4 hp drill press would bump through it no problem with Starrett Dual Pitch hole saw, I have used them all the time over the years, their brilliant as long as the speed is not too high, this is my problem, my wolf drill will do the job but I know 430 rpm is too past

                                          Regards

                                          lee

                                          #172084
                                          Muzzer
                                          Participant
                                            @muzzer

                                            Lee

                                            Sounds like a case of "physician heal thyself", except that even the physician's tools are in need of repair. One step at a time. Good luck!

                                            Murray

                                            #172088
                                            Lee Winter
                                            Participant
                                              @leewinter63836

                                              Could try using a lamp dimmer switch in line with the drill, many years ago I made a drill speed controller as a school project and the circuit was basically a dimmer switch.

                                              #172090
                                              IanT
                                              Participant
                                                @iant

                                                Not suggesting you look for one Lee – but reading your post, I was minded of the really old geared (hand-driven) bench drills I used to have (still got the smaller one under the bench somewhere thinking about it).

                                                The big one had two gear settings and an auto-down feeder on it – and with a sharp drill in it, it would chew through steel plate quite steadily (partly I suspect simply because you couldn't turn it too fast). I don't recall it being that much hard work either (I was a bit fitter back then). The small one I've still got somewhere – it just has a simple screw down-feed – but it could still drill big 'oles pretty well. I guess they were probably agricultural or blacksmiths tools but they worked.

                                                No good for the smaller drilling work I mostly do these days of course – but they were still better for some jobs than the old Black & Decker electric hand drill that was my only alternative for a while…and they drilled 'perpendicular' too which was a bit of an advantage…

                                                laugh

                                                IanT.

                                                #172091
                                                Derek999
                                                Participant
                                                  @derek999

                                                  Hello Lee.

                                                  I had a similar problem a few weeks ago with 60mm holes in 3/8" plate and a drill which was too fast.

                                                  The answer i found was to chain drill just inside the 60mm, then run the hole saw through very carefully. This gave the swarf an entry to the outside world to help keep the teeth cool.

                                                  Just a cleaning up job afterwards and job done!

                                                  Gee whiz, it worked!

                                                  Good luck

                                                  Derek

                                                  #172099
                                                  lee hawkins 1
                                                  Participant
                                                    @leehawkins1

                                                    I dont want to go doing that chain drilling method, it will drive me round the bend, very slow process , I have did this in the past and found that drilling the holes needed to be quite accurate especially in thickish steel plate, end up knocking the cutting edge of the hole saw, teeth bangs against sides of the holes

                                                    thanks

                                                    lee

                                                    #172103
                                                    jaCK Hobson
                                                    Participant
                                                      @jackhobson50760

                                                      Jeweler's saw? Depends how wide the plate is.

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