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Wiper motors: all theyre wiped up to be?

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  • Wiper motors: all theyre wiped up to be?

    Hey yall. I know its pretty bad etiquette for a first post to be a new topic but Ive been lurking around here for a while and I have some questions I was hoping you guys could help me with - so this is both a Hi Im new post, and a geniune question.

    My journey through roasting has been somewhat typical. I roasted with a popper for a while (about 18 months), then found a nice heatgun for a good price secondhand and have been mucking around in a dogbowl since then. Im looking to take the next step up and automate the process a little and Ive come to a fork in the road. Ive seen wiper motors used to power all sorts of roasting contraptions so I went and got one cheap from the wreckers to have a look at it. The motor Ive ended up with is geared to provide a one-way-then-the-other type of motion, whereas I was hoping to have it continually spinning to operate a paddle to agitate the beans in the bottom of a bowl. Ive pulled it apart and found the gears would be difficult to remove or change so I just have a spinning motion.

    So my question to you, fellow home roasters, is whether the forward-back motion will be sufficient to agitate a bowl of beans, and if so, what kind of agitator I should use, as I imagine it would have to be quite large and have 3 or 4 actual arms.

    If this works out to be too much Ill just cop out and build the Coretto (which is a fantastic invention, by the way - I consider it up there with the wheel), Im just going back and forth on the decision and was looking for a bit of advice.

    What have you guys and gals done with wiper motors? Should I persevere or wipe the slate clean and build the Coretto?

    (I apologise for the puns)

  • #2
    Re: Wiper motors: all theyre wiped up to be?

    Being a Corretto disciple Im probably biased but I think for the simplicity of a Corretto setup and the results that one achieves its hard to beat, plus set-up costs are minimal. All of the components dont take up much space in the garage or whereever one keeps them.
    Good luck with your decision..................................gm
    But, there are a lot of tinkerers in CS so Im sure youll gets heaps of tips and ideas!!!

    Comment


    • #3
      Re: Wiper motors: all theyre wiped up to be?

      Funnily enough, wiper motors turn in one direction only. You need to take the wiping arm mechanism off the motor. Then you simply match the threads for the motor with an appropriate shaft.

      For agitation, you can get a rotisserie holder for meat that has a set screw so you can tighten it onto the shaft. Just straighten the arms on the holder, and you have 4 stirring arms. Match it to a suitable pot where the arms reach the corners, and add a turbo oven for a heat source.

      You can cut a slit in the side of the pot near the bottom to allow chaff to exit during the roasting process into a container for later emptying.

      Its a bit more work than a Correto, but results are comparable.

      Comment


      • #4
        Re: Wiper motors: all theyre wiped up to be?

        I have used a wiper motor for at least a year maybe 2.
        Mine only turns one direction, and has a drum mounted directly onto the shaft.
        Drum currently has two stirring vanes fixed in it, heat source is a heat gun.
        Works very well for 200-275g batch sizes which suit me.

        It seems very odd that you only get an oscillating motion at the output end.
        If it is designed that way, suggest you take it back and get a different type that better suits your needs.

        Bullitt

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        • #5
          Re: Wiper motors: all theyre wiped up to be?

          When I bought mine from an auto wrecker, he asked what it was for, and wondered why I would want something that oscillates. In the end, the motor doesnt oscillate if you remove some bits attached to the motor.

          Comment


          • #6
            Re: Wiper motors: all theyre wiped up to be?

            Wow, thanks for the quick responses guys. Ive had a crack at removing the gearing that makes it turn as it does, but to no avail. I can take it back and see what else hes got but I was wondering if the oscillating motion could be utilised as well (mainly because its a long drive back to the wreckers and Im lazy). I was also just wondering how others on the forums had used wiper motors. Looks like theres many different ways I can go about this.

            Comment


            • #7
              Re: Wiper motors: all theyre wiped up to be?

              I guess it depends on the configuration of the motor. I use an old sv-21 Camry wiper motor. The drive changes direction 90 degrees. Attached to it is a short arm that connected to another arm that creates an oscillating motion. I removed both arms, to allow it to spin freely. The motor lies flat on the bench, and the shaft points up into the pot, which sits on two stacks of bricks.

              Comment


              • #8
                Re: Wiper motors: all theyre wiped up to be?

                22a,

                I dont think it will work as well in an oscillating motion.

                As nunu has said (Wine_of_the_bean), the best bet is to try and remove that part.

                As you have tried without luck, see if you can find one that is easier to get that bit off.

                I believe my motor is from an old Escort. The arm attachment came off fairly easily leaving a nut that spun in one direction only. I then attached a socket to the nut and the rotisserie rod fits into the back part of the socket perfectly.

                My motor sits in a bucket of stones for stability and has done something like 250+ roasts.

                Good luck.

                Comment


                • #9
                  Re: Wiper motors: all theyre wiped up to be?

                  I thought of going the wiper motor way but ended up getting a corretto going instead.

                  I agree that an oscillating motor sounds strange.

                  22a can you post a picture of your motor?

                  Comment


                  • #10
                    Re: Wiper motors: all theyre wiped up to be?

                    Oh ho ho. So Ive been away for the weekend and didnt get a chance to keep going with this project. It turns out that with a bit of blood (too much), sweat (far too much) and some brilliant lateral thinking I managed to get the gears off the motor, and re-jig it so I can have a slow rotation one way. It was not easy. For anyone looking for a wiper motor to drive beans it would be advisable to steer clear of anything from a Toyota Corona.

                    For the record, this is what it looks like now.



                    Ive drawn in where the gearing was because the gears I pulled out are no longer recognisable. The high point was the final cog I needed to get out, it was held in place by a plastic component which was unreachable with any of my tools and too strong to break. This was my proud lateral thinking moment. I resorted to my primal instincts and used fire. The plastic components melted away and freed up the pieces I wanted. It was glorious.

                    As if it wasnt good enough, I picked up an old breadmaker tin and mixing blade for $1. This is coming together nicely. Ill take some more pics and post them up when this nears completion.

                    Comment


                    • #11
                      Re: Wiper motors: all theyre wiped up to be?

                      On mine, I just had to remove something similar to the red circle on the right, and the arm connecting it. There was no massive shroud like yours, and it seems you may have gotten the entire wiper assembly.

                      Comment


                      • #12
                        Re: Wiper motors: all theyre wiped up to be?

                        I suspect youre right. However, having never seen a wiper motor before, I wasnt entirely sure what I was looking for. It all worked out for the best in the end, but that setup gave me hell getting it out. Im still trying to fit a new axle where that old cog on the right was, then Ill get to the fun part of mounting the thing and getting a heat gun in position. I think at the end of the day this might just be a lesson in wiper motor buying (not that I intend to do much more any time soon). Have a browse around and see how different ones operate before picking one up. Itll save a lot of time later on.

                        Comment


                        • #13
                          Re: Wiper motors: all theyre wiped up to be?

                          Mine was just the motor with some arms attached.
                          A very basic mechanism that came apart in seconds.
                          No shroud.

                          I think it might have been from a Rover but looked no different to the one on my old Escort.

                          Glad youve moved forward.

                          Comment


                          • #14
                            Re: Wiper motors: all theyre wiped up to be?

                            Originally posted by Thundergod link=1208469576/0#12 date=1208826239
                            Glad youve moved forward.
                            It is much better than back and forward

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