Forum Replies Created

Viewing 30 replies - 1 through 30 (of 75 total)
sort on most likes
helper
07/06/2017 at 13:47
3

Original was 2 kW.

helper
07/06/2017 at 13:23
1

I dig it!
I honestly think the double shaft is the way forward.

helper
16/08/2016 at 17:17
0

@timslab

Howzit Tim!

Yup, I had the same problem, except I knew they would cut it at 4.5mm before i received them. I had shims cut for the smaller stationary knives at 0.9mm and 1 extra stationary knife and just placed them at the end. So, basically i added in an extra knife and and extra shim(0.9mm). And spacer. That seemed to work quite well. I didnt have this problem with mild steel where they seem to have 5mm thicknesses. Its a real fiddle, but you can get it working.

So, basically I had extra items cut – items 3,4 & 8 on Daves “overview v9.pdf”
I havnt had time to test it fully, but i’ve shredded HDPE and PET bottles. Had a few issues with PET bottle necks, but I hope to fine tune when I get back to SA in Sep.

Sorry, dont have an actual picture of the head with me. Will post as soon as i do.

Hope yours comes right, post some pics when you have it up and running.

Cheers,
Paul

helper
05/08/2016 at 13:56
0

@lyricalpolymath
@xxxolivierxxx

Hi Guys,
Sorry i didn’t answer your questions earlier, though it looks like you sorted most of the problems out between yourselves.

I also had alignment problems but like you said the Jaw or Oldham couplings are more forgiving.

Are you guys still getting jams?

The tips you gave the others are pretty much what I would have recommended, particularly regarding extra friction and drag – smooth smooth smooth!

@timslab
I had the same issue with stainless, but chose to get 0.9mm shims cut for the stationary knives & spacers. I like your idea though of just shortening the shaft and 3mm parts. Did it work out okay in the end?

helper
05/08/2016 at 12:47
1

@timslab

Howzit Tim! Nice to have more Saffas on here!

Yes, but I’m not quite ready yet. I need someone to finance the next one(extruder).
I think that screw is going to be next to impossible to find in South Africa.
It looks like you can only get it on German or Dutch CONRAD in Europe.
I think my machining guy here in Durban could prob turn something similar, but I’m not sure about the hardening etc.

Hows your shredder coming on?
Did you go DOL or did you use a VSD?

Could you get 5mm stainless cut?

Shot,
Paul

helper
02/07/2016 at 17:01
1

Small demo

Attachments:
helper
02/07/2016 at 13:12
0

Looks fantastic!
Is that a hoist motor and gear?
How many Kw?
Whats the shaft size coming out of the gear?
How does it perform? Any stalls?

Could you please publish more info and pictures of the motor.

helper
29/06/2016 at 11:35
1

@aust & @andyn

Hey Guys, I like the idea of your design. Where did you get it from? I’d like to price making it, where did you get the cad files etc.? Or did you make it yourself?

Cheers,
Paul

helper
14/06/2016 at 12:40
0

@dustintweir
Are there too many variables for us mortals to roughly calculate the torque (Nm) needed to turn the screw? …And ultimately the minimum size motor needed.

helper
13/06/2016 at 16:45
0

@tymbrimi
Hey Dave!

Sounds good.

I’ll email you.

Cheers,
Paul

helper
10/06/2016 at 14:49
0

@davehakkens
Oh bugger. Sorry, thought it was something simple.

helper
09/06/2016 at 15:09
0

@keesdeligt thanks!
Do you know how many watts the 3ph motor was?

helper
09/06/2016 at 12:31
0

@keesdeligt
@davehakkens

Hi Guys,

I was unsuccessful finding your motor & worm gear specs. I’m sure you went through allot of trial and error before deciding on the gear and motor that you used in V2.
That is why I’d like to use what you used – do you have the specs for us?

If you have posted these already – sorry (I did look).

Greetings from Durban,
Paul

helper
08/06/2016 at 15:55
1

Now with control box…

Attachments:
helper
07/06/2016 at 16:53
2

Hi @keesdeligt

Goedemorgen!

Ahh, I see. Thanks for the info. I almost went for that option too, but got lazy thinking about all the extra wiring i’d have to do. Plus someone told me the safest reversing contactor systems are those that are mechanically interlocked, but they were expensive. …which comes out to just below the price of an inverter anyway.

When I get some time I would gladly do some wiring diagrams for you guys.

helper
07/06/2016 at 16:20
1

Getting ready for the final touches.
Fitted the control box, just need to wire it again and then on to the hopper…

Attachments:
helper
07/06/2016 at 10:45
1

Hey Simon!
The bike looks good!
Thanks for sharing.

helper
04/06/2016 at 10:25
2

@keesdeligt talking about broken shafts – do you know if Dave’s has some kind of motor over current protection? In the youtube vids its too quick to see. Setting these current values low could not only protect your motor, but also prevent broken shafts. That’s another reason why I went for the more expensive inverter – you can set up an over current and prevent a disaster 🙂

helper
03/06/2016 at 17:39
0

You’ll end up with a 3,25 mm gap on each shaft end AND on your stationary knives. I think you could somehow make this up with washers/spacers/shims on the shaft ends, but you are also going to have to compensate on the stationary knife part ends too – not sure how though. Maybe pieces of thin steel flat bar?

helper
03/06/2016 at 15:25
1

@lopesviii

You would then have to adjust the size of the lasered parts and the bearings accordingly. The final shaft diameter would come out considerably less – not sure if that would be okay. It seems like plenty of changes that would need to be made with the uncertainty of the shaft diameter being adequate. It may end up being more work than its worth. Then again, maybe not. Have you worked out what the shaft diameter would end up being?

helper
03/06/2016 at 11:03
1

Our Woolworths milk bottles (HDPE)…

Attachments:
helper
03/06/2016 at 11:01
1

@timslab Howzit Tim!

Sourcing the equipment was actually very easy. I’m sure it’ll be easier for you in JHB, also as far as price goes. Difficult was to try and get stuff second hand. On my shredder the only used part was the Motor (which was actually new, but sat in some blokes workshop for years because the rpms were high and its steel). If you’ve got time, and patience, I’m sure you’ll be able to get some good second hand equipment in JHB. On Gumtree, OLX and the likes, but shipping here to Durban is always an extra cost.

If you need tips or advice, just let me know and I’ll gladly help.

Be sure to let us know how you are getting on.

Cheers,
Paul

helper
30/05/2016 at 09:40
2

Looks good.
I think I’ll go for this.
Thanks!

In reply to: Surfboard fins

helper
27/05/2016 at 11:56
0

This crossed my mind too, BUT, in my opinion, plastic-only surfboard fins should be banned. Maybe for beginner soft boards or kids boards – okay. I don’t understand exactly how it works, but they just don’t perform like glass fins do. Their flex is different so you loose drive coming out of your turns.

HDPE Wax comb -yes!
All plastic surf fins – please NO! 🙂

PS. This has been a serious beer-&-BBQ debate topic, and the general consensus was the same. So, end of discussion! 🙂

helper
27/05/2016 at 10:16
0

Gruess Dich!

helper
27/05/2016 at 09:22
1

For those who are interested these are my material costs so far. The lasered parts I left as they are because the price for stainless works out to about the same. The last thee items are guessed – still need to be done. All in all I’d say its pretty much what you could do it for as a completely new machine.
Most suppliers I went to would have given about 10% less for bulk orders (I always asked for price of 10 units).
Like I said, just costs, without markup and without the time I put in…

Attachments:
helper
27/05/2016 at 09:20
0

A fine idea!

helper
27/05/2016 at 09:10
2

For those who are interested these are my material costs so far. The lasered parts I left as they are because the price for stainless works out to about the same. The last thee items are guessed – still need to be done. All in all I’d say its pretty much what you could do it for as a completely new machine.

Most suppliers I went to would have given about 10% less for bulk orders (I always asked for price of 10 units).

Like I said, just costs, without markup and without the time I put in…

Attachments:
helper
27/05/2016 at 08:24
1

@andyn
It looks really good! And so much power for such a small motor! I also like the shoot you made. The size of the shredded pieces look nice and small considering your blades are thicker. 10mm?
Had jams too, on bottle necks – I agree, a reverse button is a must!

Viewing 30 replies - 1 through 30 (of 75 total)