Sedgewick MB

[marcros]

What motors are typically found on the older models? I see that the new one has a 3KW motor, which if i understand correctly means that it might just about run on a 13A plug, or failing that a 16A.

Thanks
mark

 

[longinthetooth]

You are not going to run a 3Kw (that's 4hp!) motor on a 13A plug!! Not only that but there's a fractional hp motor for the feed as well.

 

[marcros]

it didnt sound quite right when i typed it, but i divided 3000 by 240 and it came out with 12.5!

What would i likely need? Would I get away with 16A- there is quite a step in price when you go above that isnt there?

 

[longinthetooth]

Voltage isn't always 240, it fluctuates - might be 230 at any given moment ...

Anyway - I'm not an electrician, so i can't give a number, but the wattage rating of the motor is nominal and it draws far more amps on starting. Thus a 1hp motor can sometimes blow a 13A fuse on start-up. That's happened to me.

 

[marcros]

understood. cheers.

 

[nathandavies]

my Sedgwick (secondhand) came with a standard 13amp plug on it, so I presume the previous people were using it with that. saying that I didn't try it with that, and just put a 16amp on it before using.

 

[Phil Pascoe]

Voltage isn't always 240, it fluctuates - might be 230 at any given moment ...

Anyway - I'm not an electrician, so i can't give a number, but the wattage rating of the motor is nominal and it draws far more amps on starting. Thus a 1hp motor can sometimes blow a 13A fuse on start-up. That's happened to me.

Our mains voltage was dropped to 230v a few years ago.

 

[marcros]

to be honest, when i redo the electrics, i wanted a 16A supply for a saw. It was going above that that i feared would be very expensve, although probably cheaper to design it that way, rather than need to replace the cable later on

 

[RogerS]

You may well want to have the correct breaker feeding your 16 Amp cable as my MB manual specifies an inrush starting current of 80A!

 

[fetteler]

Having just spent time last week cleaning and re-fitting the motors to my MB I can tell you that mine left the factory in 1974 with the following :

Feed,
0.325 HP
Running current 3.25A

Cutter,
2HP
Running current 10A

(data from motor plates)

A rule of thumb is that a single phase induction motor will draw about 6 Amps per horsepower... only an approximation :wink:

The machine came to me with a very poorly wired 16A connector on some flex. I have re done all the internal wiring and fitted a nice 16A male inlet. Whatever my start current is, it doesn't trip the 16A type B MCB (the usual domestic standard) in the workshop's consumer unit. For what it's worth a type B trips between 3 and 5 time full load current so a 16A unit trips somewhere between 48 and 80 Amps over a time of 0.1 seconds. I have to say that I haven't tried to start both motors absolutely simultaneously!

I hope this is useful

Cheers,
Steve.

Edited for typo - it was late, I was tired!!!

 

[marcros]

it is, Steve. Thank you. It seems that these machines have had several different motors fitted. I assume that your 2HP one does the job as expected?

 

[fetteler]

it is, Steve. Thank you. It seems that these machines have had several different motors fitted. I assume that your 2HP one does the job as expected?

Oh yes Marcos it's fine. I've not had it very long but I've certainly never thought it needed a bigger motor, it is a powerful and capable machine - I've named her "Annie". The previous owner (who it has to be said did not maintain the poor thing at all.... ) pushed a huge quantity (£25,000 worth!!!) of oak boards through her and she didn't falter... Got through a lot of blades though

Cheers,
Steve.