EQ6 Belt mod show of hands please.

[coldknights (Cathy)]

Hi Peter thanks for the info on the 4:1 Ratio working well for you and congrats on the Fantasic image as well .
This mod will reduce the grrrrrr noise and still let the owners of the EQ6 still use the SynScan Hand Controller GoTo functions.
If they want to use the Software program EQMod Only and not a Hand Controller as you said go with the 4:1 Ratio pulleys.


AstroAussie Lucas helped with the information for the 48 tooth pulleys for EQMod below.



HPC Gears in England ( I think this price is more then a year old )

2 x 12WF187 (12 teeth pulleys) bored out to 5mm
£12.08each = £24.16
2 x 48WF187 (48 teeth pulleys) bored out to 12mm
£23.64each = £47.28
3 x MXL80/3/16 (80 teeth timing belts) (I bought a spare just in case!)
£3.75each = £11.25
Postage £10.20

Total : £92.89

Below is the price I got from HPC UK 14/07/2013

HPC Gears UK below money in £


12T2.5-8 TIMING PULLEY - METRIC BOSSED 8.35 Ex-Stock
1 47T2.5-8 TIMING PULLEY - METRIC BOSSED 12.08 Ex-Stock
1 T2.5/177/4 TIMING BELTS 9.96 Ex-Stock
1 48T2.5-8 TIMING PULLEY - METRIC BOSSED 12.16 Ex-Stock

ALTERNATIVELY MODIFIED BORES
1 12T2.5-8-S05 TIMING PULLEY - 5MM BORE 12.22 2/4 DAYS
1 47T2.5-8-S10 TIMING PULLEY - 10MM BORE 15.95 2/4 DAYS
1 47T2.5-8-S12 TIMING PULLEY - 12MM BORE 15.95 2/4 DAYS

NB: ABOVE 47TOOTH IS STD 6mm BORE.

The following are the bearing replacement kit for the EQ6


4 x SKF 608-2RSH $8.88 Each inc GST
6 x SKF 6008-2RS1 $29.80 Each inc GST
1 x SKF 30206-J2/Q $15.32 Each inc GST
1 x SKF 32208-J2/Q $20.59 Each inc GST

Total $227.51 if you buy all these bearings as a complete kit.

From Wimmera Bearings Horsham

[coldknights (Cathy)]

EQ6 Teardown for the pulley and belt replacement below
Go to Page 4!!!!!!!!!

http://translate.google.com/translat...B5kP-rQwY4H_2w

[naskies (Dave)]

Originally Posted by coldknights

EQ6 Teardown for the pulley and belt replacement below
Go to Page 4!!!!!!!!!

http://translate.google.com/translat...B5kP-rQwY4H_2w

The final results for the HEQ5 belt mod that Fred_76 performed is pretty amazing:

* PE drops from +/- 23'' down to +/- 9''
* Max rate of PE change drops from 3.6''/s down to 1.5''/s
* Average rate of PE change drops from 0.70''/s to 0.36''/s

The increase in tracking performance and elimination of backlash makes it one impressive mod

[Steffen]

Will the EQ6 belt mod kit (the 47/12 one) also work on the HEQ5 Pro? I counted the teeth on the HEQ5 Pro once, but forgot…

Cheers
Steffen.

[coldknights (Cathy)]

Here is a link to the EQ5 kit BUT it is for use with EQMod only

Count the teeth on the EQ5 then look at belting online.com

Or HPC gears


http://www.beltingonline.com/heq5-be...rive-kit-12097

[Steffen]

Ok, thanks, I keep looking, and counting

I'm not interested in any mod that precludes use of the SynScan hand controller.

Cheers
Steffen.

[coldknights (Cathy)]

Hi Steffen link below for the ( EQ5 ) Pulley and belt Mod Kit. !

http://www.tavcso.hu/?o=termek&te=HEQ5bord&n=en

Send them a email just to check that these pulleys are the same amount of teeth as the the original ones.

[Steffen]

Wow, thanks Cathy for doing all the research for me! Your google-fu is better than mine Hat-tip to the Hungarians!

Does anyone have any tips on how to get the sprocket-wheels off the motor axes? This is the only part of the whole mod that worries me. I wouldn't want to wreck those motors...

Cheers
Steffen.

[1parsec (Dave)]

Hi Steffen,
I bought an HEQ5 earlier this year and didn't like the gear train 'graunching' noises. Way too loud to be neighbourly at 1am.
I've been working on a standard 9:47 ratio belt mod for the HEQ5 to allow the Synscan controller to be still used and to improve the tracking too.
The pinion gear on the motor is loctited in position and can be tricky to get off the motor shaft.
I made a small extractor which made the job worry free !

I posted a thread on Stargazers Lounge
http://stargazerslounge.com/topic/18...-947-belt-mod/ which shows the steps I made to get it all working.
The 9 tooth pulley was the tricky one ! I didn't find any supplier who stocked them.
I ended up machining them myself from bar stock in one operation which meant concentricity and true running was spot on.
If using stock pulleys, boring them out to size has to be done very carefully to ensure concentricity which is tricky to do if they have flanges.
Dave.

[Steffen]

Thanks Dave, interesting read. What would it take to coax you into making another kit?

Cheers
Steffen.

[bojan]

Originally Posted by Steffen

...Does anyone have any tips on how to get the sprocket-wheels off the motor axes? This is the only part of the whole mod that worries me. I wouldn't want to wreck those motors....

Just heat the pulley with the flame from gas lighter, locktite will melt and you will be to pull it from shaft without problems.

[Steffen]

Oh, is that all? I thought they were shrunk or pressed on.

[1parsec (Dave)]

Originally Posted by Steffen

Thanks Dave, interesting read. What would it take to coax you into making another kit?
Cheers
Steffen.

Hi Steffen,
I've had quite a bit of interest here in the UK to make kits available and I am in the process of putting some together.
It'll be about a couple of weeks before I have all the parts ready.
Thanks, Dave.

[RobF (Rob)]

Will be very interested to see what Dave puts out for NEQ6. Love the thought that looks to have been put into the HEQ5 kit (acrylic spacer panel, presumably to save milling the outer casing) and remover tool.
I'd be happy paying a bit more to have piece of mind I have the correct bits in the kit and a tool to make it all easier.

Would prefer to operate on my NEQ6 first though - HEQ5Pro currently much better behaved!

[coldknights (Cathy)]

Update on the HEQ5 Belt mod ( Dave in the UK ) below is the email I got from him Dave has done well and got the HEQ5 Kits Ready.

HEQ5 straight mod kit gear to belt no conversion in Ratio so you can still use the Synscan hand controller as Normal.

The belts are 6mm wide 2.5mm pitch. We machine the pulleys in house on our cnc machines to give a zero backlash profile.

I've added the fitting instructions to our website which shows more details about the kit - the images can be magnified in your pdf viewer if needed. Click the 'support' button at the top of the page.

The kits are now available on our website.

http://rowanastronomy.com/

YouTube Before the gear to belt change

http://m.youtube.com/watch?feature=plcp&v=TLYoN0XEBDs


After the Belt change


http://m.youtube.com/watch?feature=plcp&v=7PLo_lo9et8


Many thanks
Dave.

Thank you Dave for contributing to this Forum.

[1parsec (Dave)]

Hi Cathy. Thanks for forwarding the info on the belt kits.

Just to confirm, the kits are for the HEQ5 only and will not fit the EQ5

Thanks.
Dave.

[Steffen]

Cool stuff Dave!

One question: what purpose do the plastic rollers serve, could one not simply use a shorter belt?

Cheers
Steffen.

[bojan]

Originally Posted by Steffen

Cool stuff Dave!

One question: what purpose do the plastic rollers serve, could one not simply use a shorter belt?

Cheers
Steffen.

Easier belt tension control ? Belts could be the same size.. ..

[Steffen]

Neither the diameter nor the position of the wheels is adjustable, so tension control isn't made any easier through them, but I suppose standardising on a single (readily available?) belt size makes sense.

Cheers
Steffen.

[bojan]

But you can rotate whole the motor assembly (look at the screws and holes on pics).. which will make (with the help of secondary wheel) the tension adjustment easy(er).