Thread: Magnetic Dust Port Connectors.

bloody little smart (donkey) eh?

100 or 150mm
are you looking for a market?
what price?

Originally Posted by Tonyz

bloody little smart (donkey) eh?

100 or 150mm
are you looking for a market?
what price?

These are 100 (4") and sorry I'm not looking to make 'em for others.

Over the next couple of days I will upload the files to one of the file sharing places though, so you can print them yourself (or have them printed) if you wish.

Will post a link here when I've done that.

Cheers,

P

nice work midge.... the only thought is that magnetic field strength drops of really fast, i am interested the magnets are not level with the plastic level and glued in.

I now have four connection points and only two hoses so this might my next print job as well.

Cheers
Phil

For those without a 3D printer a couple of MDF doughnuts and 3 magnets hot glued into holes around the doughnut might be be worth a go?

Originally Posted by BobL

For those without a 3D printer a couple of MDF doughnuts and 3 magnets hot glued into holes around the doughnut might be be worth a go?

My thoughts exactly Bob, I think I'd use a bigger diameter magnet for ease of handling - at least 12mm, and it wouldn't be too hard to build a jig to churn out a few at a time.

Originally Posted by Aussiephil

nice work midge.... the only thought is that magnetic field strength drops of really fast, i am interested the magnets are not level with the plastic level and glued in.

I now have four connection points and only two hoses so this might my next print job as well.

I hadn't considered magnetic force dropping off Phil, but in that eventuality I can either double up the magnets, because there's room to do that, or simply push them out. I do lose tangible force by putting the base in, but it also makes for a really clean operation, and no need to glue in the magnets which is nice.

I haven't yet experimented to see if doubling the magnet only to the flex will make a difference - it should logically add 50% more pull.

It's early days yet, but I'm so chuffed with the result I'm considering a similar setup to swap between table saw and router rather than duplicating the flex - I have to move the table saw to use the router bench mounted in a wing of the TS, so there's a bit of mess there which can be simply dealt with in one connection.

Cheers,

P

Originally Posted by Aussiephil

nice work midge.... the only thought is that magnetic field strength drops of really fast, i am interested the magnets are not level with the plastic level and glued in.

Cheers
Phil

Same here. It's good to know that a 1.6 mm gap works well enough.

This can be a useful resource.

Originally Posted by dmorse

Same here. It's good to know that a 1.6 mm gap works well enough.

This can be a useful resource.

Thanks for that link Dave - it's a great resource that might have had me under-magneting (there's a new word for the week). Give or take, it puts my setup at around .5kg per magnet or 6k total, which I reckon is close. However because of my smooth mating surfaces, the sideways force is much less -

@Aussiephil, I misinterpreted your comment sorry! You were talking about distance apart rather than life of the magnet - but my answer is still the same - according to the link above, doubling the magnets will add at least 50% more force so I have no worries with my contingency.

BTW, I bought the magnets direct from an AliExpress vendor. Normally for small items I'd happily pay double to help a local company ticking over and keep AusPost in business, but the price difference was extreme - less than $20.00 per hundred compared to more than a dollar each in Aus, which makes that decision a trivial exercise. Perhaps there are differences in quality, but for a 600% markup there would want to be! (end rant)


Cheers,

P

As a very small afterthought, and aware as I am that this is a woodwork forum, not a "magnets and plastic" forum, I whipped up a quick little bracket that sticks to the steel column beside the dustie dropper to hold the flex neatly when not in use.

Thirty minutes on the computer (because I'm not very good at CAD), forty minutes and five 8mm magnets later I have a little bracket that looks as though it was made for the job! It's a very curious thing - feels like parking a hoverboard, but very satisfying all round.


21-02- 07 at 08-30-46.jpg 21-02- 07 at 08-30-35.jpg

I thought this was the magnets and plastic forum......

Your great work got me rolling on my own variation, I have a pile of 10x2mm magnets so the design is based around them.
I'm doing machine end adapters that get permanently connected to the machines as per the two photo's, these slip on to every 4" hose coupling on the machines i have and have the (in hindsight) overly wide cutouts to enable a standard hose clamp to get a little pressure applied
P2150072.jpg P2150073.jpg

Eight magnet holes with the magnets epoxied in level with the mating surfaces. Alternating polarity the same as yours.... A quick flatten on a sheet of sandpaper on the granite plate and i expect a near airtight connection.

Need to print a male side hose connection yet so i can test if the design works

Cheers
Phil

Originally Posted by Aussiephil

I thought this was the magnets and plastic forum......

Eight magnet holes with the magnets epoxied in level with the mating surfaces. Alternating polarity the same as yours.... A quick flatten on a sheet of sandpaper on the granite plate and i expect a near airtight connection.

Need to print a male side hose connection yet so i can test if the design works

Cheers
Phil

Nice work! I've found that printing on a Smooth build plate gives a perfect mating surface and all worked well and truly beyond my expectations - I look forward to your next chapter!

It's a bit hilarious at our house - I have two cabinets making VERY slow progress, yet every evening a new plastic part seems to turn up out of thin air. I don't think this is what my beloved meant when she said "just take your time with the cabinets and enjoy the process without any deadline pressure".

Originally Posted by bitingmidge

Nice work! I've found that printing on a Smooth build plate gives a perfect mating surface and all worked well and truly beyond my expectations - I look forward to your next chapter!

It's a bit hilarious at our house - I have two cabinets making VERY slow progress, yet every evening a new plastic part seems to turn up out of thin air. I don't think this is what my beloved meant when she said "just take your time with the cabinets and enjoy the process without any deadline pressure".

I've got the nice smooth build plate, the sanding is to remove the extraneous 5 min alraldite

I'm forever turning out things from my printer but really the better half has got bored with it a few years back... it just about ran 24/7 for the first year printing stuff i needed

P2160074.jpg

I'll have male and female pipe connectors to cater for the air flow direction, this is the male pipe connection used from a machine .... nice gentle fit so i'll add some ribbing on the pipe side so the pipe won't slip as easy.

Here is the fusion360 render of the two parts

magnetic dust ports.jpg

Next step is to glue all the magnets in and test

Cheers
Phil

Originally Posted by Aussiephil

I've got the nice smooth build plate, the sanding is to remove the extraneous 5 min alraldite

I'm forever turning out things from my printer but really the better half has got bored with it a few years back... it just about ran 24/7 for the first year printing stuff i needed

P2160074.jpg

I'll have male and female pipe connectors to cater for the air flow direction, this is the male pipe connection used from a machine .... nice gentle fit so i'll add some ribbing on the pipe side so the pipe won't slip as easy.

Here is the fusion360 render of the two parts

magnetic dust ports.jpg

Next step is to glue all the magnets in and test

Cheers
Phil

Phil, I really like what you are doing here. I have a similar situation where I use plastic conduit to do the same job, but if you sell these or you make the file available to allow us to get them printed locally it would be a far better solution.
Rgds,
Crocy.

I'll have male and female pipe connectors to cater for the air flow direction, this is the male pipe connection used from a machine .... nice gentle fit so i'll add some ribbing on the pipe side so the pipe won't slip as easy.

I reckon its better to use female connections on both sides. Flexy is already quite restrictive so adding an internal step that reduces the diameter even by a couple of mm makes a difference.