Direct stable connector to electric motor

[Jobbe van der BurgParticipant @jobbevanderburg47799]

[Jobbe van der BurgParticipant @jobbevanderburg47799]

Good day all, from the Netherlands.

I am trying to build my own coffee grinder, but running into some issue here (as I want to build a proper one).

So I want to use a single phase electric motor with start capacitor and a ‘key’layout shaft. Then I want to have the grinderplate(one side of it) directly (with connector) attached to this motor.

I am trying to find standard connector plates to the shaft, so that I only have to drill holes (if not already there) in it to connect to the grinderplate.

The important thing here is that there should not be any other movement in this creation than the rotational one (so no wiggling) and it needs a fixed distance from the motor to this grinder (I need a fixed setting on this side, because I want to make the other side of the grinder (so the other plate) movable closer or further away to adjust the grind size.

Can anyone point me in the correct direction? Help is much appreciated!

[egaParticipant @ega]

Assuming I have understood the question, would a suitably-sized pulley with keyway help to solve the problem?

Life without coffee would be sad indeed!

[Jeff DaymanParticipant @jeffdayman43397]

Hi Jobbe, if the motor and grinder shafts are perfectly aligned, a plate or flanged bolted coupling may work. If there is any misalignment or if there are intermittent loads, a jaw coupling with a flexible centre might be better. Some coupling types can be seen at the link below. If you google "shaft couplings" or "power transmission couplings" you will find many types, some firms also have design/selection guides.

https://www.jbj.co.uk/couplings.html

[Clive FosterParticipant @clivefoster55965]

Maybe a taperlock or similar hub will work for you.

A search on Google will find many varieties.

Perhaps something like this **LINK** but smaller. A bit spendy because you need to buy the taperlock bush too.

Alternatively maybe something like this locking bush could be adapted **LINK** .

There is a huge variety of things that could be adapted to do your job with an equal;y huge variety in size and price. You can be certain that should you choose and order one something with a better price / performance ratio will be suggested before it actually arrives!

Clive

PS Jeff types faster!

Edited By Clive Foster on 03/02/2021 13:28:47

[not done it yetParticipant @notdoneityet]

Look up ‘oldham couplings’ – they may be a solution (but not sure). I have used them for coupling together slowly rotating shafts. There are other types available.

[egaParticipant @ega]

I something like this of use?

It's like a dog clutch but with rubber element to take the drive and allow for minor misalignment. This one has been in stock for some time!

[noel shelleyParticipant @noelshelley55608]

Dag Jobbe, If I understand the question correctly you want to mount a grinder plate directly on to the keyed shaft of a motor ? Can you send a picture of the grinding plate ? How will you attach the plate to the mounting – with glue or screws? A machined disc bored to suit the motor shaft, the keyway could be cut with a hacksaw and held with a grub screw. Good luck Noel

[mark costello 1Participant @markcostello1]

Small LoveJoy coupling might work.

https://www.google.com/search?q=lovejoy+coupling&client=firefox-b-1-d&sxsrf=ALeKk00zQRHIdGePONQXXFHlY3zJ6st9jQ:1612379696700&tbm=isch&source=iu&ictx=1&fir=mC4JCXYjWdi_3M%252Cw2hwsAgqi1YxpM%252C_&vet=1&usg=AI4_-kSpah7C6G-s3-5WlZWQu_-EVr478g&sa=X&ved=2ahUKEwie9MG4ts7uAhWmFlkFHSgRBNYQ9QF6BAg3EAE#imgrc=mC4JCXYjWdi_3M

Hope this is permitted as it is testing the limits of My computer literacy, change if needed.

[Jobbe van der BurgParticipant @jobbevanderburg47799]

Wow, what a replies! Thanks!

This is what the grinder plates look like: https://images.app.goo.gl/33v1Tp5iMPYDNX6J7

I think that as suggested by Clive, a bolt on hub – taper bush might work. Than I only have to tap/drill a thread for the screws to attach the burr (grind plate)

[Clive FosterParticipant @clivefoster55965]

I think a taperlock bush hub may be too large. Smallest taperlock size size is 1008 which is 35 mm diameter at the large end. I imagine the hub boss will be 40-50 mm diameter. So may well need an intermediate plate if its to work with your small grind plates.

For example this coupling hub **LINK** is 104 mm overall diameter. Can't find deatiled specifications but it should be possible to measure the picture to get some idea.

Locking bushes like the second one I linked to in my first post come in smaller sizes because the design is inherently more compact.

Clive

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