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My foundry is like my table saw, band saw and ELS driven lathe.? It's a tool.? ?In the case of the foundry I have a small ATMEL processor module, pre-dates Arduino, that does PWM drive to a treadmill motor that turns the blower and a circuit with ignition coil that runs a spark plug.? ESTOP button.? ON button and a DC controlled valve from marine applications for shutting off the gas at the tank.? Propane being heavier than air could collect in the bilge of a boat.

So I press the start.? The fan comes on slowly, the spark plug starts sparking, the gas is turn on and whomp!? Flame billows out the top of the furnace (it's open for this reason).? Then the fan automatically speeds up, the flame retracts into the proper mixture and I close the lid.? 12 minutes later I have 4 to 6 pounds of melted aluminium.

When I'm done I switch it off.? Gas solenoid is closed.? Fan drops to low speed for 10 seconds to clear any left over gas and fumes.? I open the lid and pull out the crucible.

I then put the crucible back in and switch the main switch over to circulate which runs the fan at a very low speed slowly cooling the furnace interior.? And if it's in the shop in the winter, warms things up nicely without fumes.

Eventually I'll reroute the air and gas so I have a direct view into the flame past the spark plug and I'll mount the UV flame detector.? The software is there for it.? Just not the mechanics.? It's been running like this for about 20 years.

Wow! 20 years...? where did the time go...

John


> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Richard
> Sent: March-19-20 9:28 AM
> To: [email protected]
> Subject: Re: [digitalhobbyist] #LATHES Spindle Encoder Update
>
> Exactly my sentiments. I have a 3Nm driving 2:1 to a 3mm pitch screw and
> have no problems even though I am using an encoder!
> BTW I love your casting capability. I have no outside space suitable or
> I would be casting myself.
> Richard
>
> On 19/03/2020 16:08, John Dammeyer wrote:
> > Hi guys.
> >
> > The Z axis motor on my South Bend Heavy 10L with the 8 TPI lead screw is
> using the max 3A drive current from the internal micro-stepping driver inside
> my ELS.? I found that 2:1 is more than adequate for power.? I've never
> bogged it down for any turning or threading operation in the 10 years.? As
> seen by the dust on the motor surface the one pulse per spindle rev ELS has
> worked perfectly just like the thousands of MACH3 systems out there.
> >
> > The motor mount is a simple casting used twice so the motor would clear
> the bed at the back and the base would still fit on the drip tray.
> >
> > I bought a surplus lead screw end bracket and milled some of it away so I
> could mount a shaft extension for the pulley.
> >
> > If you want 1:1 for this size of lathe generally a size 34 motor drawing
> about 7A tends to be what others are using in the MACH3 and ELS world.
> >
> > John
> >
> >
> >> -----Original Message-----
> >> From: [email protected] [mailto:[email protected]] On
> >> Behalf Of Richard
> >> Sent: March-19-20 12:13 AM
> >> To: [email protected]
> >> Subject: Re: [digitalhobbyist] #LATHES Spindle Encoder Update
> >>
> >> I feel that you are seriously underpowered. If using a 3Nm stepper I
> >> would run it at 2 to 1 or more with an 8tpi screw.
> >> Richard
> >>
> >> On 18/03/2020 17:33, Ralph Hulslander wrote:
> >>> That was a first try at getting something to at least hold the motor
> >>> close to where it might go. I have other mounting ideas also.
> >>>
> >>> The leadscrew is ??-8 Acme here is thestepper motor
> >>> <
> >> Shaft-3-1Nm-439oz-in-3-5A-CNC-Reprap-
> >>
> Robot/232528913835?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057
> >> 872.m2749.l2649>?439
> >>> <>
> >>>
> >>> Ralph
> >>>
> >>> On Wed, Mar 18, 2020 at 1:10 PM Richard <edelec@...
> >>> <mailto:edelec@...>> wrote:
> >>>
> >>>? ? ? I should think so when you have it mounted on a bit of thin sheet!
> >>>? ? ? What
> >>>? ? ? Torque motor is that? and what pitch leadscrew?
> >>>? ? ? Richard
> >>>
> >>>? ? ? On 18/03/2020 16:00, Ralph Hulslander wrote:
> >>>? ? ? > Oh did you see I have a rough prototype mounting for my Z stepper
> >>>? ? ? > motor. That needs a lot of work.
> >>>? ? ? > I can feel the motor binding when I turn the leadscrew.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill
> >>> press, 40 watt laser, Consew brushless DC motors and a non working 3D
> >>> printer
> >>>
> >>
> >>
> >
> >
>
>
>