Author Topic: axial generator with lamination core (Read 114415 times)

Frank S · « **Reply #198 on:** March 15, 2019, 10:53:56 AM »

Quote from: mbouwer on March 15, 2019, 07:20:49 AM

Why not mounting the 4 mm balls side by side.
Many balls give a low surface pressure.

Many bearing design applications do not use cages or separators between the balls.
I may be wrong but from what I am seeing you are attempting to create a duel purpose bearing set that has both radial and axial thrust loading I have done this many times in a much larger scale in the manufacture of jib cranes where my bottom bearing had to preform those duties these worked perfectly although what I made was not required to constantly rotate

mbouwer · « **Reply #199 on:** March 15, 2019, 01:56:11 PM »

Assembly. No axial play because that is adjustable by means of the M 6 bolts.
Radial play I can improve I think by more accurate grinding.

mbouwer · « **Reply #200 on:** March 19, 2019, 05:31:32 AM »

By the more accurate grinding of the raceways the radial play is reduced.

Unlike Reply# 188 the pitch rods and the pitch bearing are now recessed in the main bearing.

mbouwer · « **Reply #201 on:** March 21, 2019, 07:05:28 AM »

I wonder if, in case of this axle low rotational speed, also a slide bearing can be used.
It is easier to construct, and I now have the main shaft (143 mm diameter)

Frank S · « **Reply #202 on:** March 21, 2019, 09:38:29 AM »

Not sure in which context or application you are considering the cylindrical slide bearing for. but in general bearing surfaces of this type are seldom used for constant rotation without there being dissimilar metals as in Babbitt to hardened steel or an alloy a constant source of lubrication would be required to reduce the friction between 2 large surface areas. However all prototyping experiments deserve evaluations.

SparWeb · « **Reply #203 on:** March 21, 2019, 10:55:55 PM »

A brass sleeve may also work in this.
I expect this assembly will need a thrust bearing component, too. Just not visible yet among the photos. Looking forward to seeing it!

mbouwer · « **Reply #204 on:** March 22, 2019, 05:55:03 AM »

You mean brass lamella?
But because the surface pressure is so minimal and the speed is so low,
I thought of fitting steel on steel with grease in between.

SparWeb · « **Reply #205 on:** March 22, 2019, 11:57:48 PM »

No I was thinking of a brass sleeve. Not sure of the dimensions of your bearing, but judging by eye, I'd say 5mm to 10mm thickness of wall, in a cylinder turned on a lathe.
In the english language, this is called a "journal bearing". Looks like this:

MattM · « **Reply #206 on:** March 23, 2019, 08:02:49 AM »

Or 'bushing'. But like was said before, you need consistent lubrication with one.

mbouwer · « **Reply #207 on:** March 25, 2019, 12:22:00 PM »

The hub is Ã¸ 143 mm inside diameter ( shaft is Ã¸ 142.8 mm o.d.)
I will fit a few grease nipples in it.

mbouwer · « **Reply #208 on:** March 27, 2019, 05:08:30 AM »

Lubricating nipples and the grease inlet holes at the tread.
Now I need the correct type of grease.

mbouwer · « **Reply #209 on:** March 31, 2019, 05:32:06 AM »

My new stator bracket as part of the slide bearing.

mbouwer · « **Reply #210 on:** April 10, 2019, 06:35:36 AM »

Of course, this bearing does not turn as smoothly as a ball bearing,
but will this be a problem at 30 rpm?

mbouwer · « **Reply #211 on:** April 13, 2019, 04:22:41 AM »

This I find a beautiful shape with a lot of space to mount the pitch adjustment.

mbouwer · « **Reply #212 on:** April 13, 2019, 05:18:21 AM »

Together with the blade suspension and adjustment rods.

SparWeb · « **Reply #213 on:** April 14, 2019, 01:37:02 PM »

I am, as always, deeply impressed by seeing this come together.

Can you give some general measurements of blade diameter, chord, and the range of pitch motion that is possible with your machine now?

mbouwer · « **Reply #214 on:** April 15, 2019, 04:29:43 AM »

It is just a test fixture. The final goal now is 5 m blade diameter, direct drive generator and a calm rotational speed of the blades.
Range of pitch motion is about 90 degrees (stroke 8 cm)
And I must say the slide bearing is not ideal due to the viscosity (very sirupy) of the lubrication.

Mary B · « **Reply #215 on:** April 15, 2019, 03:58:11 PM »

Teflon sheet in the bearing may help... https://www.amazon.com/Soles2dance-Various-Industrial-Strength-self-Adhesive-TEFLON-3M-all/dp/B071GJQN4Q

Or even PTFE sheet... might hold up better depending on the stresses in that area. Telfon is soft and might flow...

mbouwer · « **Reply #216 on:** April 17, 2019, 04:27:39 AM »

First I want to try to improve the ball bearing from Reply #199.
Based on these rings of ball bearingssteel GCR 15

mbouwer · « **Reply #217 on:** April 18, 2019, 04:22:40 AM »

The bearing rings now neatly fit in each other
to, afterwards, enable the grinding of the raceways for the 4 mm balls.

mbouwer · « **Reply #218 on:** April 20, 2019, 04:33:27 AM »

Hub. The raceways are not grinded yet.
Weight 1950 grams.

mbouwer · « **Reply #219 on:** April 21, 2019, 03:39:39 AM »

In the inner bearing rings inserts are needed
to get the balls in the groove.

mbouwer · « **Reply #220 on:** April 24, 2019, 08:50:36 AM »

Shaft. Now I have to grind the grooves in the hardened rings.

mbouwer · « **Reply #221 on:** April 26, 2019, 09:21:25 AM »

The bearing weighs 3425 grams and it's enjoyable it runs smoothly with no significant play.
Now I need to modify the statorbracket.

midwoud1 · « **Reply #222 on:** April 26, 2019, 10:15:06 AM »

Hi Rinus.
That's absolutly craft.
Do you have an angular contact bearing , because I see a window to mount the bearing balls ?
Is there a way to grease the bearing ?
Good luck ,, midwoud1

mbouwer · « **Reply #223 on:** April 26, 2019, 05:25:42 PM »

It's now radial with deep grooves.
But you're right that an angular contact bearing should be more suitable.
And maybe it's possible to make an adjustable design.

mbouwer · « **Reply #224 on:** April 27, 2019, 09:57:16 AM »

The modified statorbracket (version 27-04) is made of very thin material
and therefore I thought of local thickening of the suspension points.

mbouwer · « **Reply #225 on:** April 28, 2019, 06:35:47 AM »

Rear view of the shaft with statorbracket
mounted on the yaw bearing of reply #76

electrondady1 · « **Reply #226 on:** April 30, 2019, 09:24:17 AM »

i want to encourage you by saying, if it does not work as planed it will still make a wonderful decoration for the top of your Christmas tree.

mbouwer · « **Reply #227 on:** May 01, 2019, 04:01:43 AM »

Front view with mounted magnet disks, stator, blade suspension, pitch adjustment.

electrondady1 · « **Reply #228 on:** May 02, 2019, 08:38:05 AM »

wonderful workmanship

mbouwer · « **Reply #229 on:** May 08, 2019, 08:19:22 AM »

It's clear to see that the inner diameter of my bearing does not have to be so wide to contain the bearing and fork ends of the pitch adjustment.
Therefore I now want to find new hardened rings with smaller inside diameter to shape an angular contact bearing.

JW · « **Reply #230 on:** May 11, 2019, 06:48:24 PM »

I love following your progress

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Author Topic: axial generator with lamination core (Read 114415 times)