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11
Tools / Re: Homemade carbide flymill
« Last post by vtsteam on January 17, 2018, 07:24:45 PM »
Thanks David!  :beer:
Glad to re-read it myself. I really should make a 3" version -- forgot about that intention. :scratch:
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Our Shop / Re: my backyard home workshop (in Brazil)
« Last post by jb3cx on January 17, 2018, 06:35:17 PM »
Nice shop ,the only thing missing is swarf .
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Our Shop / Re: my backyard home workshop (in Brazil)
« Last post by tom osselton on January 17, 2018, 02:48:40 PM »
Nice shop and well laid out.
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Tools / Re: Edgwick Lathe
« Last post by hermetic on January 17, 2018, 01:17:58 PM »
AAAH! they bolt on! never had an Edgewick lathe, but time yet, although I have two lathes already, but I am not trying to give them up! I have an eye on a Harrison locally............................................
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How do I?? / Re: One for the Chemists - water softening solution.
« Last post by awemawson on January 17, 2018, 12:40:24 PM »
Yes Pekka, the phosphate free bit was the first thing that struck me.

I've no doubt this stuff will work in the sense that if introduced into the water it will prevent calcium deposits. What I don't know is if it's electrical conductivity will be sufficient to pass enough current between the sensor electrodes that detect an empty tank (no current flow between electrodes). The electronic valve timer module is inhibited if an empty tank is detected.

A quick test will soon show though  :clap:

These inhibitors don't remove existing calcium deposits, so I will probably set it up to recirculate a phosphoric acid solution by letting it suck it's feed water from a (plastic) bucket, and having removed the 0.6 mm nozzle from the lance let it pump back into the bucket.
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How do I?? / Re: One for the Chemists - water softening solution.
« Last post by PekkaNF on January 17, 2018, 12:30:17 PM »
That's interesting...it says no phosphates...and the stuff I keep on bumping on this total loss system is hexametaphosphate. Like here:
https://www.plumbingsupply.com/scale-inhibitor.html


And  where it leads me:

pH control

Another vital parameter in water treatment is controlling the pH of the water. Due to their buffer (pH regulating) capacity, orthophosphates and purified phosphoric acid can keep the pH level of the water as constant as possible.
Corrosion inhibition

Phosphates are used to reduce corrosion in water mains. This may be either anodic corrosion or cathodic corrosion.

Limescale inhibition softening agents

Hard water causes the build-up of limescale deposits in pipes, leading to a lower water flow rate and therefore higher pumping and cleaning costs.
Polyphosphates can trap calcium and magnesium. Calcium is the source of limescale formation and can dissolve the compounds formed, which prevents deposits from building up. Depending on the pH of the water, preference will be given to either SHMP (sodium hexametaphosphate) or STPP (sodium tripolyphosphate).

http://www.prayon.com/en/our-activities/products/industrial-applications/water-treatment.php

But the karcher stuff is phosphate free...There may be different chemical systems, I could ask my friend. He used to work with power plants ans he is now in a company that makes water treatment systems for ships. Scale problems with boilers should be pretty analogous to this hot water washer heater - I think.

So, is it possple that karcher pump or boiler materials don't like phosphates? That leaves two more options: Polyelectrolytes and chelatants.
http://www.chemtreat.com/solutions/scale-deposition/

Could it be one of these?


Pekka
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How do I?? / Re: One for the Chemists - water softening solution.
« Last post by awemawson on January 17, 2018, 12:05:15 PM »
Well amazingly some RM110 Karcher water softener fluid has turned up on eBay. This is the stuff recommended for the MPDS precursor the  HDS 1000 DE :thumbup:

I shall order some and try it for conductivity :coffee:


https://www.ebay.co.uk/itm/KARCHER-Water-Softener-RM-110-For-HDS-Hot-Pressure-Washer-6295625-6-295-625-0/192429550659?hash=item2ccdb1ec43:g:CYQAAOSwLF1X2Se4



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CNC / Re: The basics
« Last post by Will_D on January 17, 2018, 11:46:51 AM »
So now I am getting very confused!

I have run F360 to generate a simple "spot drill 3 holes" program. This outputs a lot of G-code and some of it involves the machine home position.

As I understand the Machine home co-ordinates in the DDCSV controller are the smaller co-ordinates to the left of the Large co-ordinates which represent current workspace. No mention of this in the old manuals!

The machine co-ordinates are manipulated by using the red MACH co-ordinate system .
This system defines the soft limit sets.

X and Y are understandable in both co-ordinate systems (using G54 as default) but Z is totalling confuding me.

Do I set my G54 Z home (zero) position to the tool tip on the workpiece?

I am hoping to find a video entitled "first cuts with F360 gcode" and how to set up the machine.

One other question: I can fit hard limit switches to X+, X-, Y+, Y- and Z+. Does any one use a limit switch for Z-? 

Having spent a lot of time and money on this project I am not sure if this controller is up to the job as a Mill controller. It seems to designed as a CNC router.

See the attached file
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Tools / Re: Homemade carbide flymill
« Last post by Meldonmech on January 17, 2018, 07:41:03 AM »
 
 Hi Steve

                 Glad to see the pics. Missed these on first showing. Great surface finish on the iron, considering your inventive lttle tool holder. Just shows you don't need expensve holders.

                                                                                             Cheers David
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Tools / Re: torch for metal melting foundry (audio in portuguese)
« Last post by Meldonmech on January 17, 2018, 07:30:49 AM »
 
  Hi Celso
                      Some good ideas on this torch, and made mostly from off the shelf stock items. Easy to make for any one with limited machinery.
                                 Well Done
                                                          Cheers David
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