design chuck diam.1400

[scheggia]

Hi.
the company for which work has the need to design + realize a spindle for processing on details in polyethylene of the 1400 dia for a h of 300 max. we thought to use a ralla , but there are no ralles that can reach up to 500 laps for the smallest details, a board sent us and to mount the axial and radial bearings but our skills do not allow us to develop the project, the tolerances to maintain
Thank you.

 

[PaoloColombani]

Hi.
the company for which work has the need to design + realize a spindle for processing on details in polyethylene of the 1400 dia for a h of 300 max. we thought to use a ralla , but there are no ralles that can reach up to 500 laps for the smallest details, a board sent us and to mount the axial and radial bearings but our skills do not allow us to develop the project, the tolerances to maintain
Thank you.

the first thing that seems to me to notice is that having a maximum height of 300 mm you do not need to pass a ø1400 bar, so you are not obliged to use such high diameter bearings, or for some other reason you are obliged?

 

[scheggia]

does not need the hole for the bar passage I can attach 3d photos to what we started as a study

 

[scheggia]

Attached in bmp format

 

[meccanicamg]

the ralles exist of any diameter, beyond 4 meters see catalogue.

certainly not needing the bar pass you can use a radius of diameter less than 1400 mm even if more regrets and more increases the flexional game.

in your system you must also keep in mind making a pneumatic rotating distributor to feed your cylinders.

correctly dimensional the cylinders, not to soothe on the forces because the centrifugal force in diameter 1400 mm to 500 rpm for a mass of 10 kg is worth:
fc = m*w^2*r = 19147 [N] = almost 2 tons

= 2*3.14*n/60 = 52.3 [rad/s]with m = mass [kg]w = angle speed [rad/s]r = d/2 = radius [m]

 

[scheggia]

perfect 500rpms serve on details from the dia, 400mm for the details of diam 1400 I thought to turn around 150/170rpm take into account that as overmetal there is not much for the distribution of cylinders I found a product that can do to the nosro case.
Thank you.

 

[meccanicamg]

perfect 500rpms serve on details from the dia, 400mm for the details of diam 1400 I thought to turn around 150/170rpm take into account that as overmetal there is not much for the distribution of cylinders I found a product that can do to the nosro case.
Thank you.

undoubtedly the 170 rpm for 1400 mm of diameter otherwise you shoot the pieces on the nose.

then you will have centrifugal forces with an order of magnitude less.

the ralles are at a ball crown, with two series of cross rollers, with gear and without. all the spindles of the numerical control lathes are mounted on the raddle and the torque motor is mounted. by now conical roller bearings use them only on small parallel lathes or without bar passage.

 

[scheggia]

I thought I'd use a two-series roller raddle crossed with external gear is I have to connect it to a motor (your hand to the customer) of 3000rpm to 400v what kind of pinion can utlize I have to insert a gearbox
I thank you

 

[meccanicamg]

I thought I'd use a two-series roller raddle crossed with external gear is I have to connect it to a motor (your hand to the customer) of 3000rpm to 400v what kind of pinion can utlize I have to insert a gearbox
I thank you

I was peeking that there's the rotomors that makes herds like yours.

if you have to turn from 150 to 500 rpm you have to do the calculation of the useful torque you need for processing (fixing of truciole) and calculation of the inertias.

Surely the raddle will have a high number of teeth and you will have to pair a pinion that allows you to have the right range of turns. of course the engine of the customer must have sufficient torque and mounted under inverter. It's very likely that you do it quietly without having to interpose additional gears between the wheel and the engine.

 

[scheggia]

grazie per le info

 

[PaoloColombani]

I thought I'd use a two-series roller saddle...

It is not its application, the ralles or bearings with cross rollers are designed for applications other than those for spindles, it is so much the energy you spend to maintain your rotation regimen and in addition go to risk of overheating the component. I recommend you contact the manufacturer to advise you, if necessary the technical offices of bearing manufacturers are always well prepared to indicate the solution and the most suitable components, is their trade.

 

[meccanicamg]

Cross rollers generally is for almost static use with very high forces. there are ralles with ring bearing with two sets of balls. are more performing for higher dynamics. clearly since we are as product type, I also recommend you to be followed by your supplier regarding the specific requirement.