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HF 12 inch disc sander

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Forum topic by pantango posted 11-18-2012 07:50 PM 1491 views 0 times favorited 11 replies Add to Favorites Watch
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pantango

51 posts in 731 days


11-18-2012 07:50 PM

Hello,

Went to HF to get the 12 inch disc sander from central machine. I noticed on the tag “Motor: 120V, 22.7 amps (start), 1.25 HP, 1750 RPM” .

22.7 amp start? Won’t this trip a 20 amp breaker? Do I need to run a dedicated line for this machine?

Wondering if anyone has one for home workshop use

Thanks
Dean

-- Hate how work gets in the way of my hobby!!


11 replies so far

View toolie's profile

toolie

1769 posts in 1319 days


#1 posted 11-18-2012 08:09 PM

probably not. what it probably means is that at full load, the unit can draw over 20 amps. that would mean a 30A line would be the safest thing to install for it. but if you’re not going to overtax it, a 20A line will probably be ok. when i ran my unisaw and DC together on the same circuit, the combined FLA (full load amp) rating of the machines was 22A (16A unisaw and 6A dust collector). never tripped a dedicated 20A 220v breaker on 12/2 gauge wire. just my $.02.

-- there's a solution to every problem.......you just have to be willing to find it.

View Bill White's profile

Bill White

3500 posts in 2651 days


#2 posted 11-18-2012 08:39 PM

IMHO, don’t bother with the HF unit.
I would have some real issues with the accuracy. There are some bargains at HF, but I don’t think that the “discker” is one of ‘em unless ya wanna just do some roughing.
If ya have a table saw, why not use a disc blade for better accuracy?
Bill

-- bill@magraphics.us

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pantango

51 posts in 731 days


#3 posted 11-18-2012 09:34 PM

?

-- Hate how work gets in the way of my hobby!!

View pantango's profile

pantango

51 posts in 731 days


#4 posted 11-18-2012 09:37 PM

Toolie,

I was thinking of running a seperate line for my dust collector, I might as well add another for this sander. I have 8 open spots on my panel.

Its about a 20 ft run from one end to the other.

-- Hate how work gets in the way of my hobby!!

View RussellAP's profile

RussellAP

2959 posts in 977 days


#5 posted 11-18-2012 10:08 PM

I don’t think HF ever sold anything capable of pulling 22 amps.

-- A positive attitude will take you much further than positive thinking ever will.

View dhazelton's profile

dhazelton

1218 posts in 987 days


#6 posted 11-18-2012 10:19 PM

The website says 5.7 amps – gotta be a mistake on the label. How thick is the cord? If just extension cord thickness I’d believe the 5.7 number.

View exelectrician's profile

exelectrician

1666 posts in 1118 days


#7 posted 11-18-2012 11:47 PM

Lets do the simple math guys. 1.25 multiply by 746 equals 932 Watts. As we all know 932 Watts will draw 932 devide by the voltage which is 110 Volts – so the Maximum current at full load is 8.47 Amps. All induction motors draw two to four times the full load current for a brief moment at startup. Hence the (stupid) 22.7A printed on the name plate.

I had the Central Machinery 10” disc sander. the aluminium boss was a lousy fit on the shaft. I tried all of the usual gimmicks to “cure the problem” . I just took it to the dump.

-- Love thy neighbour as thyself

View patcollins's profile

patcollins

1003 posts in 1556 days


#8 posted 11-19-2012 01:26 AM

Contrary to popular belief there is nothing magic in a circuit breaker that will make it pop at the exact value on it.

After sustained use a 20A breaker can pop at 19A, or in short bursts you can get by with 22A on it. They are not high precision devices, just something “close”

View pantango's profile

pantango

51 posts in 731 days


#9 posted 11-19-2012 01:55 AM

exelectrician….seen the 10 in model right next to it. The 12 inch seem to spin free as the 10 inch model stopped right after you push it. The 12 inch seems heavy duty.

Well, maybe I’ll take the plunge on it

-- Hate how work gets in the way of my hobby!!

View crank49's profile

crank49

3458 posts in 1662 days


#10 posted 11-19-2012 01:58 AM

Any motor can draw 4 to 6 times its “rated” full load amps on startup.
Breakers handle this all the time.

Machines with large inertial loads (which take several seconds to reach operating speed) might require special breakers designed for this service, but it’s not normally a problem with most shop tools.

I have the HF 12” disk sander and it does say 22.7 amps start. Seems to be about in line with what a 5 or 6 amp motor would draw on startup. I just plug it into the same power strip my miter saw is plugged into and have it mounted next to the miter saw. Very handy to tweek the fit of some miters. Been using this setup for over a year without any problem. It’s a nice little sander IMHO.

I might have rather had the Rikon with its cast iron table and disk, but it’s well over $200; and for $200 I would have rather had the Ridgid oscillating belt/spindle sander. So, bottom line, I think the HF 12” disk, at $100, is a good tool at a good price and mine works just fine..

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View exelectrician's profile

exelectrician

1666 posts in 1118 days


#11 posted 11-19-2012 07:32 AM

Pantango … grab the disc on the one you want to buy and try to pull it off…. if it moves just a little bit, try the next one untill you get one that has a disk that is tight on the shaft. You will find that the price difference between the 12” spare abrasive disks and the 10” is quite a lot. Also the hassle of changing a 12 is more than a 10.
And the surface speed of the outer edge of the 12” WILL BURN wood very easily. My 10” burned wood on the edge all the time. After I got my 8” I realized how much better it is to sand with a 8” than a 10” so yeah I really like my 8” because it is almost impossible to burn wood.

-- Love thy neighbour as thyself

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