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Fine Setting

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Fine Setting

Postby sambo1985 » Sun May 28, 2017 9:07 pm

Hello I just recently bought a Lincoln 305G EFI. Make question is can someone please explain he fine setting dial. Its 1 through 10 and I am just having trouble grasping the idea on the dial and what increments do each number represent.

Thank You
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Re: Fine Setting

Postby MinnesotaDave » Sun May 28, 2017 9:43 pm

As an example, my bobcat 225nt has its lowest coarse setting of 50-100 amps.

At zero on the fine, 50 amps
10 on fine, 100 amps.

100 - 50 = 50 amps.

This means that every number on the fine is 5 amps added from the bottom number.

My mid-range is 70-150 amps

150-70 = 80 amps.

So each number on the fine is 8 amps more.

0,70
1,78
2,86
3,94
4,102
5,110
6,118
7,126
8,134
9,142
10,150
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Re: Fine Setting

Postby Poleframer » Sun May 28, 2017 9:52 pm

Use the right coarse current setting for the rod you're using, it's a range of amps, then fine tune it for what you're doing. It adjusts the amperage within the range of the course current setting. Run some beads with different rods, and play with it till you are comfortable with it's function.
A welder is like a girlfriend,gotta rub them the right way, each one is different :D
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Re: Fine Setting

Postby noddybrian » Tue May 30, 2017 2:31 pm

If your 305 G EFI is a Ranger I think we may be misunderstanding the question - old school Lincolns made for mostly pipeline / site work had fine & course ( like SA 200 / 300 etc )- we had a Ranger 305 ( Kubota diesel powered ) & that is an inverter welder - the main amps are marked in a rough 1 > 10 around the control knob but it displays actual current on an LED display next to it accurate to 1amp - the smaller knob which is covered by a drop down flap marked 0 > 10 is arc force the same as a mains powered inverter machine often has ( sometimes in a menu or hidden menu on all digital display models )
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Re: Fine Setting

Postby sambo1985 » Tue May 30, 2017 3:08 pm

Noddy ryan youbare right. I ment to mention a bobcat 225 that had fine setting or any other machine that I might weld with in the future. And i just need a correct answer in the future
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Re: Fine Setting

Postby Otto Nobedder » Tue May 30, 2017 8:13 pm

I'll comment that it's wise to set your course dial so your desired setting will be in the top half of the fine adjustment. This gives you the finest adjustment. If you look at Dave's explanation, you'll see if you're looking for, say, 90A, you can get that with either the lowest coarse setting, or the next one up. In the lowest setting, your 90A is near the top of the range, and the sweep of the "fine" knob covers a smaller range of total amps available at the knob. This gives you more precise control. If you go to the next range up, the same turn of the "fine" dial covers a larger range of amps, so less sensitive and less control.

Steve
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Re: Fine Setting

Postby noddybrian » Wed May 31, 2017 3:07 am

I never seen a Bobcat welder over here so can't comment on that model but many engine drives I've seen / used have a fine / course control combination which is not quite as simple as just amps - one has an effect on arc voltage so the combination of which range / fine setting will effect the nature of the puddle width & freeze time ( generally on ones I've used the fine control if used near it's upper end will give higher arc voltages which can be useful but not always ) - think you have to get used to & get dialed in on the machine you are using - we used to have some good welders made locally by " Petbow " that had separate amps & volts controls - these were great once you got the hang of them as the current markings need some interpreting .
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Re: Fine Setting

Postby ttreb4 » Wed Jun 28, 2017 9:41 am

I have a Miller Bobcat 225G. I have watched fieldRes youtube video explaining the amperage/voltage. I understand that he is using the Lincoln SA. Is the Bobcat the same in that the fine dial is adjusting voltage and not amperage? I would be better off running the large adjustment nob at the top end of the range and then running a lower fine setting to reduce the amount of voltage in the weld?
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Re: Fine Setting

Postby MinnesotaDave » Wed Jun 28, 2017 11:22 am

ttreb4 wrote:I have a Miller Bobcat 225G. I have watched fieldRes youtube video explaining the amperage/voltage. I understand that he is using the Lincoln SA. Is the Bobcat the same in that the fine dial is adjusting voltage and not amperage? I would be better off running the large adjustment nob at the top end of the range and then running a lower fine setting to reduce the amount of voltage in the weld?


It's a combination.
To get the same amperage, a low coarse setting lets you be in the upper part of the fine range. Higher arc voltage.
For the same amperage while using a higher coarse setting you'll be in the lower part of the fine range. Lower arc voltage.

High arc voltage is great for 7018 in my opinion.
Lower arc voltage is often considered desirable for 6010 vertical up.

I tend to set amps with a low coarse, high fine, because I like high arc voltage - others may differ.

My bobcat 225nt works good with the fine in the upper half of the fine range, as Steve noted.
Dave J.

Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

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Re: Fine Setting

Postby olek » Wed Jun 28, 2017 5:02 pm

I am curious , on many inverters, the voltage have no regulation or display.

But , is not the arc force function raising the voltage ? The "dig" function have a role or is it only when volts go low as arc shorten
Too much ( if I am not wrong) ?

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