1962 Hobart ADI-364 foot pedal adaptation
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  1. #1

    1962 Hobart ADI-364 foot pedal adaptation

    Hello,

    I am about to purchase a Hobart ADI-364 AC/DC stick/tig machine. I am looking for a foot pedal. I have found a manual online but the part number doesn't help. The input receptacles for remote control are a 3 prong and 2 prong. I'm not sure about the ohm resistance required. Does anyone know if the foot pedal from a TR-250 would be usable (Part number:362668)? or if I could use a miller RFC-32a pedal?

    Thanks for the helps guys.

  2. #2
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    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Quote Originally Posted by Campbell45 View Post
    Hello,

    I am about to purchase a Hobart ADI-364 AC/DC stick/tig machine. I am looking for a foot pedal. I have found a manual online but the part number doesn't help. The input receptacles for remote control are a 3 prong and 2 prong. I'm not sure about the ohm resistance required. Does anyone know if the foot pedal from a TR-250 would be usable (Part number:362668)? or if I could use a miller RFC-32a pedal?

    Thanks for the helps guys.
    If the unit is anything like the Hobart TG-301 Tig Unit w/300aAC & 300aDC (circa1967)then it may utilize the lower wattage Remote. The TG-301 utilizes a 25watt- 23k Ohm Foot pedal Control. This was later Mag Amp technology for use with Tig cycling with balanced circuits(Proportional Commutation). If it is SCR rectifier Controlled then it may utilize the miller RFC-32a foot pedal since the voltage load is passed through a higher resistance.

  3. #3

    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Allhand,

    Thanks for the response. I mistyped on the miller pedal I referred to - I meant miller RFC-23a but I don't think that will work anyway.

    I've posted this question on the Hobart forums and got one response that believes (but not sure) the pedal had a 25 watt 75 ohm rheostat in it. Speaking with SCC controls, they do not make a pedal for this machine and expect it to use high wattage rheostats due to its age. Hobart, Miller, and Thermal Arc are not sure what pedal should be used.

    Does anyone know by inspecting the machine's internal rheostat what rheostat should be used for a pedal?

    Thanks again

  4. #4
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    Re: 1962 Hobart ADI-364 foot pedal adaptation

    From memory the Hobart machines of that era had a vacuum tube device under the removable top cover, as I recall, in the left corner closest to you if you're standing in front of the machine. The foot pedal was a tin box about the size of a shoebox.
    If that's the machine I may have a foot control for it.
    As I recall the pot in the box is a linear pot maybe 5 or 10 watts made by Ohmite.

    If that's the control you're after I can do some digging and hopefully find it.

  5. #5

    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Virgil,

    I’ve attached a photo of what I believe the pedal would look like. It has a 2 pin and 3 pin connector. If you have one that’d be great!



  6. #6

    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Also thats what the welder looks like
    Last edited by Campbell45; 12-06-2018 at 05:56 PM.

  7. #7
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    Re: 1962 Hobart ADI-364 foot pedal adaptation

    The footpedal pictured is not one I have.
    It resembles a P&H pedal and housing.

    If it can be accessed to photograph the bottom with the cover removed so the variable resistor can be seen there might be a better shot at getting information.

    A second way of getting the resistance and wattage would be opening the machine and deriving the information from the panel mounted rheostat there.

    I have a bad feeling this machine may use a very high wattage rheostat for fine control.

  8. #8
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    Re: 1962 Hobart ADI-364 foot pedal adaptation

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    Here are pics of my foot pedal for my Hobart TG-301. As you can see it is the same type that most of the older welding units use. Also are the pics of the size comparisons and the back of the foot pedal opened up to see how it is assembled. This model foot pedal is a #1411 and has a 25w .32amp ohmmeter rheostat.

  9. #9

    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Virgil and Allhand,

    Thanks again for the information and pictures. I had assumed until now Hobart used gears instead of millers slide rheostat (resistor?) pedal design.

    So Virgil, if I understand you correctly, I can open the machine up and find out it's internal fine-adjustment rheostat ratings. Thinking out loud, that would make sense as the the machine has a switch for local and remote. The remote rheostat should be the same as the welders internal rheostat, yes?

    It seems finding an original pedal will be rather difficult. Perhaps if I can figure out the ratings, I can make my own pedal. Unfortunately, this will most likely be a high amperage rheostat.
    Last edited by Campbell45; 12-06-2018 at 09:47 PM.

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    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Lets not panic just quite yet.

    As my cat says there is more than 1 way to skin a mouse, and till I hunt up and eyeball the one I have I'm 97.49765% sure Hobart Bros (the real company) made a design change to get away from the cast pedal and box. Someplace in the back of my dusty file system I half recall the mechanism inside the tin box being similar to the one pictured, but I ain't sure.

    At least we now know the value of the rheostat, and that's half of the battle.

  11. #11
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    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Quote Originally Posted by Campbell45 View Post
    Virgil and Allhand,

    Thanks again for the information and pictures. I had assumed until now Hobart used gears instead of millers slide rheostat (resistor?) pedal design.

    So Virgil, if I understand you correctly, I can open the machine up and find out it's internal fine-adjustment rheostat ratings. Thinking out loud, that would make sense as the the machine has a switch for local and remote. The remote rheostat should be the same as the welders internal rheostat, yes?

    It seems finding an original pedal will be rather difficult. Perhaps if I can figure out the ratings, I can make my own pedal. Unfortunately, this will most likely be a high amperage rheostat.
    If the welder doesn't have a rheostat you will just get a circuit ohm reading up to the contactor. It appears that this Hobart Model came with the removable remote so you can walk at a distance and adjust current while welding and plug it back into the cabinet when finished. A lot of the older engine Drives were built this way also. You can take the rheostat that you purchase and install it into a box and plug it into the Remote Receptacle mode and also make a foot switch that plugs into the contractor receptacle that passes the 24v through the foot switch to start the weld current contactor. The Rheostat is even small enough to attach a belt clip to and control it from your waist area if you needed. 25watt 250ohm.Name:  DSC_1680.jpg
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  12. #12

    Re: 1962 Hobart ADI-364 foot pedal adaptation

    Thank you for the help guys. I will try to figure out the rheostat ratings and continue to look for an original foot pedal

  13. #13
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    Re: 1962 Hobart ADI-364 foot pedal adaptation

    As I recall the center of the steering wheel thing is more of a ditch box setup than a foot pedal. Never played with one myself so I ain't gonna hazard a guess.

    I think Slob has one with the ditch box, and he may be able to help you with that idea. Suggest you PM Slob.

    The trick to the foot pedal is getting about 60° of pedal travel to amplify itself to 260° of rotation on the rheostat. That was accomplished by the gears, but that is tough to replicate unless you're a machinist.

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