New (old) Garrard RC98L

[gadget73]

Looks like the 50hz part to me. If your mains are 60hz, thats why. Need the other pulley, or a guy with a lathe to turn it into the other one. If it would help you I can dig mine out and get measurements on the 60hz part for you if you know someone who can turn it down but you may be better off finding a whole motor or just the pulley from a donor unit.

 

[Juva]

If I lower or raise this pulley, will it work?

 

[gadget73]

no, its just the wrong part.

 

[Juva]

I measured it at rotation 33, it's giving 37

 

[Juva]

I bought it used, but I think it has already been used here in Brazil

 

[Juva]

Do you have pulley measurements? I'll have it turned

 

[gadget73]

I'll try and get them when I get home.

 

[Juva]

Is yours 50hz?

 

[Juva]

minha rede elétrica é 220 volts, mas utilizo em uma fonte que transforma 220 em 110 volts

 

[Juva]

Good evening, could this capacitor be the problem with the acceleration of the motor? see photos

 

[gadget73]

The cap is just a noise suppressor for the power switch. Keeps it from arcing and making a pop through the speakers. Has nothing to do with speed.

Mine is a 60hz model, brass pulley.
Measurements are from top (16 rpm) to bottom (78 rpm) in inches because thats what my old precision measuring gear reads in.
0.088"
0.176"
0.238"
0.415"

 

[gadget73]

hm, from the service manual



Mine doesn't have this but maybe yours does?

 

[Juva]

Se eu girar a polia do eixo no sentido anti-horário, isso reduzirá a velocidade? está escrito neste manual

 

[Juva]

I'm connecting my Garard to 110 volts, do you still think it could be the motor pulley? thanks

 

[gadget73]

if yours has the governor, which I've never seen, then it can be adjusted. If not, its probably the pulley. The voltage doesn't much matter on a synchronous motor. It runs at a speed determined by its basic design and line frequency. Measure your pulley steps and see what they are.

 

[Juva]

what instrument did you measure your pulley with?

 

[gadget73]

a micrometer, but if you have a good set of calipers that would probably be fine too. if its a 50hz part, each step will be about 20% larger.

 

[Juva]

look at the pulley, i measured it with a caliper, (78-12.5mm) (45-7mm) (33-5mm) (16-3.5mm)

 

[gadget73]

3.5mm = 0.138"
5mm = 0.198"
7mm = 0.276"
12.5mm = 0.492"

my measurements for reference

0.088"
0.176"
0.238"
0.415"

your measurements relative to mine
1.57x
1.12x
1.16x
1.18x

assuming no measurement error from either of us, yours will run 57%, 12%, 16% and 18% faster than mine on 60hz depending on the speed selected. 37 rpm is 11% over 33.3 rpm so your measurement for that speed vs your measurement of the pulley compared to mine tracks very well.

I think one of us is just wrong about that 16 rpm measurement but the others can probably be explained by slight measurement errors, pulley wear, and unit conversion.

 

[Juva]

this spring seems a little loose, see photos