Country Circular Saw 5.5kW, 350mm Blade, 2900 RPM: Reduce High Rotation & Waving Issue

Question

Hello, I have a country with 5.5 engine kW three-phase, 2900 revolutions. Pulley on the 130 engine, and on the saw shaft 100. The saw is 350 mm. After starting the saw begins to wave. How to reduce turnover? Change pulleys? I am asking for advice.

fuutro · Accepted Answer

You can buy a special inverter, but it will be drastically cheaper to give another wheel - a larger diameter for a shaft with a saw or a smaller one for a motor shaft. What are the allowable turns for the shield you have?

When you look around, you have less than 3800 revolutions per minute for the disc rotation, so you have about 400-500 revolutions. Can't see defects on the shield? Is it not rubbing against idle? Is there any beating on the shaft?

fuutro · Accepted Answer

There is no one good answer, since the shield is old then try even the same wheel as on the shaft with the shield.

henryk987 · Answer

Thank you for your answer. Unfortunately, the shield is old and has no inscriptions on it. In that case, how much smaller wheel should be on the motor shaft?

Anonymous · Answer

I insert a table from the Globus catalog. At the moment you have revolutions, as your colleague fuutro has already written, slightly below 3800 / min, which for normal saws is the permissible speed, but not recommended. Recommended rotation for a 350 mm saw according to this table is 2200 to 3550 / min - you have a no name saw, but probably the working parameters of saws from other manufacturers do not differ from Globus. You can reduce these revolutions to those recommended by using e.g. pulleys with the same diameter on the motor shaft and saw shaft. Also pay attention to the diameter of your clamping discs - according to the table, they should be at least 100 mm.
Besides, somehow I can't imagine waving a saw with such a small diameter - maybe this saw just beats you instead of waving?

wnoto · Answer

In my opinion, it makes no sense to combine with pulleys.
Just replace the shield with a better one.
We will get the effects:
- new for relevant (current) turnover
- sharp teeth (spectral)
- 3800 revolutions is not a problem for new ones (read descriptions)
- stiffer

Prices start from several dozen zlotys.
What's cut
Are you sure there is no beat on the shaft?

qr · Answer

you checked for a replacement on e-bay

Anonymous · Answer

Do you know what to do? Measure the particularly axial runout on the clamping disc, as is normal to buy a new disc, and leave speed alone. Inverter for 'krajzegi'

fuutro · Answer

Why are you laughing? The inverter was even used for a small cheap table drill with a tap No sense, except that the threads were cut straight.

adamzaza · Answer

With this data from 1 post the saw spins 3770 rpm. turns are ok. Waving the saw may result from damage to the saw (overheating). Check and clean the saw attachment on the shaft.

robokop · Answer

For an ordinary steel saw for cutting fuel it is too high revs, moreover the saw is prone to scrap if it is prone to scraping, it is overheated (probably just by cutting without a spit or cutting with too high revolutions) - a matter of time when it will break or snatch a fragment from it.

plazermen · Answer

Gentlemen, can you treat the inverter as a replacement for different sizes of szajba? For example, I have 35-70 diameter discs and it would suit me not to change the wheels every time. I am mainly interested in whether reducing the speed of the inverter results in an increase in the moment as when changing the ratio or does the moment remain the same?

Anonymous · Answer

The moment can be at most the same or smaller. Power decreases proportionally with speed and cooling decreases.

zimny8 · Answer

A twisted saw can be saved under the press, provided it is worth it.

Country Circular Saw 5.5kW, 350mm Blade, 2900 RPM: Reduce High Rotation & Waving Issue

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