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mapstar

The Mapstar 22" build

244 posts in this topic

Excellent job big man. I had similar convoluted thoughts of such an arrangement myself. Certainly wouldn't have been as finely executed as yours ūüĎć

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Spent the afternoon creating lots of brass turnings.

Heres the machining pics 

20170321_123030.thumb.jpg.a6df402ff3e7d8e509516879bf2510db.jpg

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Two nice shiny blocks ready for the next stage.

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Two mounting plates and the T shaped brush holders :thumbright:

20170321_173729.thumb.jpg.80e4cb41f1a760898b674058b80ca174.jpg

Not quite finished as I've got the hole in the bottom to bore which will accept a 9.5mm spring and 10mm diameter copper brush.

The copper hasn't been delivered as yet so I will finish them hopefully tomorrow.

It is just a case then of drilling two holes through the rocker box bottom and fitting the mounting plates to accept the brush holders.

Another photo of the holders as they will be mounted in the rocker box. Two button head M4 screws retaining each brush box in the mounting plate.

20170321_173805.thumb.jpg.fa29f4695320e56f753a5048d699d0cc.jpg

 

Edited by mapstar
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Nice looking mill... what is it?

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Just what I need, having spent 2 days off and on trying to make a rectangular hole three quarters of the way through a piece of 15mm ally' using a milling bit in a pillar drill :grin:

Dave

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Oh dear! I must start paying more attention....

:dark1:

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5 hours ago, Davey-T said:

Just what I need, having spent 2 days off and on trying to make a rectangular hole three quarters of the way through a piece of 15mm ally' using a milling bit in a pillar drill :grin:

Dave

Bring it along to the PSP sure it will get sorted 

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Managed to get the slip rings finished off today :grin: 

First off I drilled a 10mm hole in each brush holder to accept the copper rod. Here it is with the brush holder still in the milling machine vice.

20170323_090617.thumb.jpg.47559fd7a9d38b3e0304731db2689b5a.jpg

The hole had to be deep enough to accept a decent slug of copper for the brush and also the spring. Here we are with all the parts assembled and also the exploded view. I'd soldered a copper braid to each brush for a reliable connection which wouldn't just rely on the spring and copper to brass. The braid was brought through what would be the brush holder top.

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A crimped lug then completed the whole assembly. 

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Two square section holes were then cut through the lower board of the rocker box using a 1/4" router and a jig.

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After these were both cut I gave them a quick coat of paint to seal the ply and inserted the brush holders with a little vaseline to lubricate and stop them tarnishing. 

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Pressing one of the brushes down on the spring

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It was then a case of refitting the rocker box on the ground board.

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The only thing left to do is connect the cable to these with crimped lugs once I know the length to the rocker socket. I will probably fit an insulating cover over these but the power tank is double fused so o.k. for now 

I plugged in the battery and tested at the holders for volts :thumbsup:

Onto the next Mod which is a new Spider 

Damian

 

Edited by mapstar
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Hi Damian, looking good,your talents show no end, it will really be a great addition to your scope,hope your keeping ok?

Regards

Mike

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Looking good Damian hope you manage to complete it by tomorrow for the starparty 

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2 hours ago, Demon Barber said:

Hi Damian, looking good,your talents show no end, it will really be a great addition to your scope,hope your keeping ok?

Regards

Mike

Cheers Mike as you know I've been meaning to complete this mod for a while.

New spider to document next. Looking at the weather I should be  out tonight but packing for the PSP tomorrow. 

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Lovely job!! Great skills

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14 minutes ago, niallk said:

Lovely job!! Great skills

Thanks. More to come :wink:

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Just a couple of questions:-

  1. Did you really need to wear a glove to demonstrate the "push" action of the brush?
  2. Another bloody spider? How many will that be?

Regards,

Mr Technical

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3 minutes ago, Uplooker said:

Just a couple of questions:-

  1. Did you really need to wear a glove to demonstrate the "push" action of the brush?
  2. Another bloody spider? How many will that be?

Regards,

Mr Technical

Answers:-

1 No but it keeps my hands soft :grin:

2 errrrrr MK3 :wink:

Hope it's given a few pointers. 

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Ok, I can tell I'm going to seriously, seriously, enjoy reading this build thread once I've finished reading your other very impressive thread pertaining to the heart of this Dob, Damian :) 

Just had a quick skim through so far; all I can say is your Dob is truly priceless and unique, absolutely love the look of it! how cool is a carbon fiber secondary holder! that and the multitude of other thoughtful touches I've only glimpsed at so far. A proper labor of love. 

Plus you have a milling machine which is pretty cool :) 

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Somebody got out the wrong side of the bed!!!!!!!!!!!  :icon_biggrin: 

Mike

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59 minutes ago, Chris Lock said:

Ok, I can tell I'm going to seriously, seriously, enjoy reading this build thread once I've finished reading your other very impressive thread pertaining to the heart of this Dob, Damian :) 

Just had a quick skim through so far; all I can say is your Dob is truly priceless and unique, absolutely love the look of it! how cool is a carbon fiber secondary holder! that and the multitude of other thoughtful touches I've only glimpsed at so far. A proper labor of love. 

Plus you have a milling machine which is pretty cool :) 

Not quite as epic as the other thread Chris.

Thanks for the recognition, the scope will be hopefully getting some starlight this weekend at the PSP. 

The milling machine rebuild is here if you missed it as it makes for another Interesting read :wink:

http://www.model-engineer.co.uk/forums/postings.asp?th=119748

Edited by mapstar
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12 hours ago, mapstar said:

 

1 No but it keeps my hands soft :grin:

 

 

So when is the commercial due out for the hand cream then ?

:cat:

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