Low budget plasma setup, what do I need?

machinedude
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13 May 2020 06:36 #167609 by machinedude

Replied by machinedude on topic Low budget plasma setup, what do I need?

thingiverse has a few 3D printed ones you could use for idea's here was one from a quick search on their site.

www.thingiverse.com/thing:4030225

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tecno
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13 May 2020 08:41 #167626 by tecno

Replied by tecno on topic Low budget plasma setup, what do I need?

Hi Rod,
I am redesigning the Z and yes I will provide with floating head.

The torch is a P80 type with power hose and a wire for HF so I assume it is not shielded?

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tommylight
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13 May 2020 09:17 #167631 by tommylight

Replied by tommylight on topic Low budget plasma setup, what do I need?

tecno wrote:
Hi Rod,
I am redesigning the Z and yes I will provide with floating head.

The torch is a P80 type with power hose and a wire for HF so I assume it is not shielded?

Nope, pretty sure it is not shielded.
Although a shield can be made for any torch and attached to the cup.

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tecno
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13 May 2020 14:18 #167650 by tecno

Replied by tecno on topic Low budget plasma setup, what do I need?

How long stroke do I need for the floating head?

This is what I have at hands a couple mini rails as in picture below.

I assume that the weight of the torch will force this arrangement down so I might not need any spring?

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tommylight
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13 May 2020 15:20 #167651 by tommylight

Replied by tommylight on topic Low budget plasma setup, what do I need?

That will do just fine.
Using one of the carriages for the floating part is quite easy to implement, but my drawing skills are gone the way of the Dodo, but still i will give it a try later, like at 2 or 3 AM when i move to my bedroom to catch some zzzzz.

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tecno
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13 May 2020 17:13 #167669 by tecno

Replied by tecno on topic Low budget plasma setup, what do I need?

With this setup I get about 20-25mm of travel for the floating head.

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tecno
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13 May 2020 17:19 - 13 May 2020 18:36 #167670 by tecno

Replied by tecno on topic Low budget plasma setup, what do I need?

Also I now have a wedge to easily remove the whole Z for storage, needed as I have so little space

(common issue for many of us).

Last edit: 13 May 2020 18:36 by tecno. Reason: spelling

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tommylight
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13 May 2020 18:14 #167671 by tommylight

Replied by tommylight on topic Low budget plasma setup, what do I need?

Nice and really nice !

20mm is plenty. it just have to move so it can trigger a micro switch/proximity sensor, so even 5mm will do in a pinch.

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phillc54
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13 May 2020 23:49 - 14 May 2020 04:37 #167683 by phillc54

Replied by phillc54 on topic Low budget plasma setup, what do I need?

I think you only need enough movement to allow a safe overrun, my Z axis has a maximum feed rate of 60mm/S (3600mm/min) and accelleration of 600mm/S/S which should give an overrun of around 3mm but my float movement is only 1.75mm so I just make sure my probe height is good and my probe speed is not too fast.

Oops, another Phill mistake...
I have 4mm of float movement and the switch activates at 1.75mm so I have 2.25mm for overrun. I could probably up my accelleration and make it stop within the 2.25 but... if it aint broke...

Last edit: 14 May 2020 04:37 by phillc54.

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rodw
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14 May 2020 07:44 #167707 by rodw

Replied by rodw on topic Low budget plasma setup, what do I need?

Looks good. After I used mine for a while, I added a set screw with a lock nut between the two moving surfaces so I could adjust the distance it needed to be moved to the barest minimum. Maybe you can embed some nuts into the 3D printed parts.

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Low budget plasma setup, what do I need?

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