Mount counterweight

[MarkAR]

4 minutes ago, david_taurus83 said:

£400 for a lump of steel! I'd be looking for threaded steel bar for a shaft and use nuts to hold weights in place!

He needs weights not the bar hence the big lumps.

[johninderby]

Heres a Rowan counterweight in 303 stainless. Note the locking screw is short and M10 and a brass rod is used. Bit more complicated drilling of the locking hole though but no big deal.

Edited May 15, 2020 by johninderby

[tooth_dr]

I was going to say, it's hard to find long M8 or M10 bolts that are tipped in brass or nylon, with the plastic knobs on top.  Most are 55-60mm max.

[Gorr_77]

14 minutes ago, MarkAR said:

He needs weights not the bar hence the big lumps.

and i have only 350mm counterweight bar length ,

How about  i will ask for : 303, 150mm diameter instead 120, then: 32m centre hole and 10mm side locking hole.  - weight of that plate is: 21kg.. - ufff - it will be massive task to lift it, probably too much. 120mm diameter x 150 lengt = 13kg weight.

We see whats the cost.

[Gorr_77]

1 minute ago, tooth_dr said:

I was going to say, it's hard to find long M8 or M10 bolts that are tipped in brass or nylon, with the plastic knobs on top.  Most are 55-60mm max.

but I could do what johninderby mentioned above: split bolt and pin

[Gorr_77]

But, if i can get from Rowans it will be similar price:

Counterweight 7.7Kg / 17lb .
To fit 1.875 diameter shaft.
£115.95
Available UK only. Shipping by

[tooth_dr]

36 minutes ago, Gorr_77 said:

but I could do what johninderby mentioned above: split bolt and pin

Yes I know, just confirming what John said.  If it's not much dearer to buy premade, it would save any hassle.

Edited May 15, 2020 by tooth_dr

[johninderby]

And Rowan is very helpful and I’m sure could make up the weights to your needs and they would be top quality. 👍🏻

Maybe get a quote from them. 🤔

Edited May 15, 2020 by johninderby

[Gorr_77]

4 minutes ago, johninderby said:

...Maybe get a quote from them. 🤔

I've already asked, since you mentioned

[Gorr_77]

just had an reply form " my" man:

Hi Greg,

303 would be easier to machine, but this would be more expensive in 150mm dia...

What would you like me to do?

[tooth_dr]

At the risk of 'pestering' your man, I would be inclined to get what you want firmly decided and then just proceed with the final design, and send this over.   It obviously depends on how well you know him though.

[Gorr_77]

I've got Rowans quote:

3 x 7.7kg only -in 303 Grade,  fully machined, with screws / pins / 3.25mm bore - no inserts. = £345

I was looking to get cheap steel weights ie. celestron CGX-L - £115 for 10kg... if i  can find a used one.....yep....

Edited May 28, 2020 by Gorr_77

[Gorr_77]

... and the winner was : Rowans  - 2 weeks waiting time.... Unfortunately i couldn't find anybody who would do it cheaper or quicke - i am happy with that

I tell you what : i've had an online quote: £1960...!!!! fair enough, i did say no

 

Edited May 28, 2020 by Gorr_77
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[johninderby]

7 minutes ago, Gorr_77 said:

... and the winner was : Rowans  - 2 weeks waiting time.... Unfortunately i couldn't find anybody who would do it cheaper or quicke - i am happy with that

I tell you what : i've had an online quote: £1960...!!!! fair enough, i did say no

 

At least of Rowan is doing it you know it will be right. 👍🏻