Lazer zxr - Page 270

alcyon · #**5381** 21-02-2017

Quote:

Originally Posted by isobarik

So rama the anser would be that you have to make an

B4slipperlayshaftwithpinnedpulleysfor the lazer zxr

Mvh isobarik

naah i am gonna try one piece double pulleys.
The side near to spur will have full length splines, because it is possible to do so here on the layshaft.
As for the one way end, the splines must be shorter but i have lengthened the splines just a tiny bit.
There is also a 4,5mm thick guide in between to take up the gasp left by removal of thrust bearing.
I am however unsure of the pulley spline size and accurate shape so i guess this will have to be done a few prints before getting right.
Another idea i have is to make this pulley 1 tooth bigger, 15tooth, it should fit well as the belts are a tad loose anyway.

Welshy40 · #**5382** 21-02-2017

Quote:

Originally Posted by rob m

Is this what you remember James?
I've had it like this for 3 years now and still on origional gearbox casing . It's had a few bad knocks aswell!
if this could be added into the design it would be spot on, adds load of strengthening.

Yes, thats it. Simple yet very effective.

Welshy40 · #**5383** 21-02-2017

Quote:

Originally Posted by isobarik

So rama the anser would be that you have to make an

B4slipperlayshaftwithpinnedpulleysfor the lazer zxr

Mvh isobarik

Mmm dont think its going to be that easy as its harder to balance. Easier to do the pulley separately or as per Ramas optima design make a pulley with the same design so it bolts to the layshaft for the rear pulley only.

Welshy40 · #**5384** 21-02-2017

Quote:

Originally Posted by alcyon

naah i am gonna try one piece double pulleys.
The side near to spur will have full length splines, because it is possible to do so here on the layshaft.
As for the one way end, the splines must be shorter but i have lengthened the splines just a tiny bit.
There is also a 4,5mm thick guide in between to take up the gasp left by removal of thrust bearing.
I am however unsure of the pulley spline size and accurate shape so i guess this will have to be done a few prints before getting right.
Another idea i have is to make this pulley 1 tooth bigger, 15tooth, it should fit well as the belts are a tad loose anyway.

For the people who dont use oneways then yes its a good idea but dont forget the thrust bearing isnt flush so may find you will need to make fractionally wider.

As you know im a one way fan so do like your idea on adding a tooth, yes for nicads it didnt work but with brushless it should make it better especially down the straight. It should take fractional torque away giving more control, possibly may suit the dirt surface racers as well due to this.

Your rear gear box looks stunning. I would like to add a lower tensioner like my runner but is on the edge of the underside so a little bulge will come through so will do some measurements when I get some more time and let you know.

The address is the correct one if you still have it but will pm you it again. I will eventually get onto whats app but will do hopefully within a month or so when I get a new phone.

alcyon · #**5385** 22-02-2017

Actually looking at the layshaft and one way, I think we can make two different pulleys, one for one way (shorter spline), and one for rear belt (longest spline). Externally they will be the same. I think this will solve the issue too, because I only damaged my rear pulleys anyway.

Welshy40 · #**5386** 22-02-2017

Quote:

Originally Posted by alcyon

Actually looking at the layshaft and one way, I think we can make two different pulleys, one for one way (shorter spline), and one for rear belt (longest spline). Externally they will be the same. I think this will solve the issue too, because I only damaged my rear pulleys anyway.

Yes, same here.

Suzukitudor · #**5387** 22-02-2017

One piece for all 4wd will be stronger as the load will be spread between the two pulleys.

My tuppence worth.

alcyon · #**5388** 22-02-2017

Quote:

Originally Posted by Suzukitudor

One piece for all 4wd will be stronger as the load will be spread between the two pulleys.

My tuppence worth.

Welcome back Alex !. I will offer both choices ok ?

https://www.shapeways.com/product/WY3M3DJWQ/la-11-r
https://www.shapeways.com/product/S3GDDM7FH/la-11-f
https://www.shapeways.com/product/WNJSAGHJL/la-11-tw

Tomorrow, I will work on the 15 tooth pulleys.

Suzukitudor · #**5389** 22-02-2017

I like the sound of 15 tooth...... Looking forward to destroying a pulley in the interests of testing. Well I dont actually want to.

Thinking of adding thread lock help take some of the load off the splines with the surface area of the inserts.

alcyon · #**5390** 23-02-2017

15 tooth done.

https://www.shapeways.com/product/7P...i=user-profile

https://www.shapeways.com/product/BS...i=user-profile

Welshy40 · #**5391** 23-02-2017

Very nice, so just out of curiosity how much would it cost in alloy?

alcyon · #**5392** 24-02-2017

Quote:

Originally Posted by Welshy40

Very nice, so just out of curiosity how much would it cost in alloy?

About $23.

HKS_TRD · #**5393** 24-02-2017

Quote:

Originally Posted by alcyon

Ahh indeed this is clever but i find it a bit dangerous when disassembling. We may forget to slide the upper deck sidewards and could damage those upper supports.
Dan,
Shapeways also offers printing in alloy materials but the price isn't cheap and i have not worked out the tolerances yet. I spent a lot of time and money to adjust the bearing tolerances before I got it right. Its not as simple as putting a 14mm hole for a 14mm bearing. I had to compensate for shrinkage and those shapeways people didn't know squat about this.

Welshy, i will send you this gearbox for you to test. I will check my old email for your address, I think no change of address ?
If you have whatsapp we could stay in touch quicker. Right now we have a huge worldwide whatsapp group and Alex T.H and Dan Rowlands is in it.

I have used 3D printed gearboxes on my Optima Mid and it took punishments well. I did crack a few rear GB earlier on, but I thickened and reinforced my designs and so far holding up.

Is there anyone that could CNC the front gearbox in alloy?

Welshy40 · #**5394** 24-02-2017

Quote:

Originally Posted by alcyon

About $23.

Ok, now thats value and think when I get paid may have some spare just for those.

rob m · #**5395** 25-02-2017

Quote:

Originally Posted by HKS_TRD

Is there anyone that could CNC the front gearbox in alloy?

you have been wanting an alloy front gearbox for so long now. Do you want it to look the same as origional? That would be a lot of set up and machining time on a cnc millling machine , if you remember i looked into ut myself a couple of years ago but my boss wouldn't let me make any on the cnc's at work as it would take to much time and with me not having any issues with my gearbox I never wrote the program's to machine it. Im guessing an alloy one can be made on a 3d printer but im not sure how the tolerances are withh these as ive never seen an alloy printed part, just plastic parts.

fil9144 · #**5396** 25-02-2017

Quote:

Originally Posted by rob m

you have been wanting an alloy front gearbox for so long now. Do you want it to look the same as origional? That would be a lot of set up and machining time on a cnc millling machine , if you remember i looked into ut myself a couple of years ago but my boss wouldn't let me make any on the cnc's at work as it would take to much time and with me not having any issues with my gearbox I never wrote the program's to machine it. Im guessing an alloy one can be made on a 3d printer but im not sure how the tolerances are withh these as ive never seen an alloy printed part, just plastic parts.

Issue is alloy 3D print silly money at the moment still

Welshy40 · #**5397** 25-02-2017

It would be cheaper if you did the left and right sides and not the very back or front section out of alloy. My race car in 90's was cut away so just the left and right and think I only managed to break one in ten years so would be cheaper if you could do that.

HKS_TRD · #**5398** 25-02-2017

Is there any merit in a gearbox design with CF side plates and a 3D printed main body

Welshy40 · #**5399** 26-02-2017

Problem is the zxs design tried to do something but it was weak and couldnt take a beating whereas the zx/zxr gearbox is beyond the normal and is far stronger than most cars including the YZ10.

I think just cutting the rear middle section away and making it alloy would be suffient.

isobarik · #**5400** 27-02-2017

Quote:

Originally Posted by HKS_TRD

Is there any merit in a gearbox design with CF side plates and a 3D printed main body

something like the one oosh123 made alu and carbon sides

would like to get hold on him and order one since when he offered those i didnt had the foundings.....

i have always been thinking flanged bearings and alusides machined just bolted with the fourscrews on the bottom and ears for the shocktower attachement...

like the one skidrow made for his lazer but more original like .................without the topcover for the belt of course

mvh isobarik