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Low profile printed Crayford focuser.

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49 replies to this topic

#1 Chriske

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Posted 14 September 2014 - 05:17 AM

Hi,

 

This focuser (own design) has been printed during our open door yesterday.

Height 2",  inner diameter will accept 2" focuser barrel.

Material : PLA, Printing time 5 hours 30 minutes.

This prototype is printed in the lowest possible resolution, so it's not looking perfect or nice at all. First some growing pains and errors have to be eliminated.

Print cost : a whopping 2$ and 45cent  <-- this value is correct...!

 

printed-focuser-V3-1.jpg

 

printed-focuser-V3-2.jpg

 

printed-focuser-V3-3.jpg

 

printed-focuser-V3-4.JPG

 

printed-focuser-V3-5.JPG

 

printed-focuser-V3-6.JPG


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#2 mark cowan

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Posted 14 September 2014 - 08:03 AM

Very cool. :waytogo:

 

Best,

Mark



#3 iwannabswiss

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Posted 14 September 2014 - 08:28 AM

Every time I see these threads, I really, really want a 3d printer.  For low resolution it all looks good, are you also making the barrel?


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#4 Chriske

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Posted 14 September 2014 - 10:52 AM

Yep,

 

I have a small and a large lathe, and also a large milling machine.

And btw, why not make yourself a 3D printer....?



#5 GJJim

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Posted 14 September 2014 - 11:11 AM

The "cost" you cite might need some rethinking. If this low-res part used over five hours of time on a 3D printer, it only makes sense to add that to the total. People who don't own a printer would pay considerably more for the same part made at a 3D job shop.


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#6 Cary

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Posted 14 September 2014 - 11:20 AM

Good quality 3d printers are not that expensive now days.  Her's a couple that I am familiar with:

 

http://printrbot.com...ple-makers-kit/

http://printrbot.com...d-simple-metal/

 

-Cary


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#7 Chriske

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Posted 14 September 2014 - 11:34 AM

The "cost" you cite might need some rethinking. If this low-res part used over five hours of time on a 3D printer, it only makes sense to add that to the total. People who don't own a printer would pay considerably more for the same part made at a 3D job shop.

Jim,

 

That is exactly the reason why we started building printers in our workshop. Parts printed in a specialized shop are ve-ry expensive indeed.

A year ago I needed a small part and I would have payed 45 $ for it. Start counting : 10 small parts makes ONE 3d printer, it"s as simple as that...!

 

btw, busy preparing to build printer nr. 10....  It is very addictive :drool5: Lucky I have my pal Marc to do all the buying and help assembling these printers. He's a bit of a 3D weirdo... :grin:

All day long my printers and my polishing machine are running for hours, while I work on other telescope-parts.



#8 Chriske

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Posted 14 September 2014 - 11:37 AM

Good quality 3d printers are not that expensive now days.  Her's a couple that I am familiar with:

 

http://printrbot.com...ple-makers-kit/

http://printrbot.com...d-simple-metal/

 

-Cary

Correct Cary,

 

We always make a very simple model : Mendel Prusa i2

Very simple to build, very cheap and very reliable printers.



#9 Herr Ointment

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Posted 14 September 2014 - 04:15 PM

I'm going to go sharpen my tools.



#10 Relativist

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Posted 14 September 2014 - 04:47 PM

I also built my own 3-D printer myself last year. It was a group build, best way to go IMO.

 

also, would you mind sharing the STL file?



#11 Chriske

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Posted 14 September 2014 - 07:20 PM

No problem at all, you can use my file as is. But again it is a prototype. I did not test it myself yet.

I'll add the source file (Autodesk Inventor) and also a converted STP file. You need to edit convert it to imperial to fit rods and bearings.

Have fun..!


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#12 Chriske

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Posted 15 September 2014 - 02:18 AM

Curtis,

 

Forgot to mention and you need to know before you start printing,The barrel that goes into this focuser has no plane like most other Crayford barrels.

We always make our focusers this way. Over the years during course we made literal hundreds of Crayford focuser this way and it works just fine without that plane(and it saves you the milling part.. ;) ). This way the wall thickness can be made rather thin, It's only 1.5 mm(about 1/16"). It seems thin indeed but we've tested that to over the years, and it is strong enough. To be honest, I do not even know how thick other focuserbarrels really are.

 

Good luck..!



#13 Chriske

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Posted 15 September 2014 - 03:23 AM

Busy drawing a second version. This next one will allow a dual speed focusing knob.

We always use(d) these dual speed devices, but I think they're not available anymore..??

So I think we now have to look for some other dual speed knobs.



#14 BoriSpider

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Posted 15 September 2014 - 08:38 AM

Great print Chriske. I love how you model in your own support and didn't leave it up to the

slicer to manage the support. During the many years I have followed 3d printing I don't think

I've encountered this. They either leave it up t the slicer, reposition the model, or reprogram the

slicer to do it their way.



#15 Chriske

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Posted 15 September 2014 - 02:54 PM

Great print Chriske. I love how you model in your own support and didn't leave it up to the

slicer to manage the support. During the many years I have followed 3d printing I don't think

I've encountered this. They either leave it up t the slicer, reposition the model, or reprogram the

slicer to do it their way.

I had to apply the support in that large hole myself because otherwise Slic3er would have applied some support in the small square holes to...I think, (did not test it) If some support was applied in these small holes there was no possible way I could have removed the leftovers completely after braking out. Look closely and you'll notice some small leftovers in that large hole. I will remove these with a Dremel tool or a small file or knife very easily. That would not be possible with these small holes because these square holes are way to small for a Dremel or file.

The dimension of these support 'rods' was guessing and sheer luck it worked out perfect. Diameter of these rods 1/16" and about 1/4" apart.

Settings, I never leave it to Slic3r at all. What settings I apply depends on what object I will print. For example, to speed up things during prototyping I always use layer height 0.35/0.35 and Infill 0.1.  I made about 20 pre-settings to choose out depending what object I will print.



#16 Chriske

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Posted 21 September 2014 - 05:51 PM

Hi,

 

This is the second one, not printed yet. Maybe tomorrow.

This one is a dual speed focuser. I did not use a planetary gear system, but single gears instead. I found these small gears on a shelf waiting to be used some day, so I thought why not.

The large knob is single speed, the smaller has a 5:1 ratio.

This is how it looks like without the lid.

 

printed-focuser-V6-1.jpg

 

printed-focuser-V6-2.jpg

 

The blue(also printed) part is a sliding block. This block(containing a ball bearing) pushes the focusing rod against the barrel. That's why the small hole lower left.

printed-focuser-V6-3.jpg



#17 BoriSpider

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Posted 21 September 2014 - 08:11 PM

Some more great work. Nice.



#18 Chriske

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Posted 25 September 2014 - 09:14 PM

Ok,

 

This is what I got so far, the first prototype. This one to is printed in the lowest possible resolution.

 

Pressing the focuser-rod while turning the knobs it feels incredibly light and very smooth.

The only thing to do is making the focuser barrel, and a lid to cover the gear housing.

 

printed-focuser-V6-4.JPG

 

printed-focuser-V6-5.JPG

 

 

Some 'adjustments' had to be made...

printed-focuser-V6-6.JPG

 

printed-focuser-V6-7.JPG

 

printed-focuser-V6-8.JPG


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#19 iwannabswiss

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Posted 25 September 2014 - 10:08 PM

Great build.



#20 Chriske

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Posted 26 September 2014 - 02:20 AM

Meanwhile using this dual speed focuser as is, without it's barrel, I discovered that the 5:1 (small) knob was located to low on it's unit(not enough finger-space while sitting on a scope). So I relocated the gear-train to have that knob at a more ergonomically 'correct' position.



#21 BoriSpider

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Posted 26 September 2014 - 06:16 AM

:bow: :applause: :applause: :rockon:



#22 Chriske

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Posted 26 September 2014 - 07:50 AM

Thanks guys for the kind replies... ;)

 

Once this dual speed focuser is ready and 100% operational, I'll post these source files to.

And at the same time I'll post the source file to print our reduction 2" to 1"1/4 adapter ring.

Total cost to make this dual speed focuser ± 12€ --> 15.5 $, all included.



#23 Grahaml

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Posted 26 September 2014 - 04:51 PM

amazing :bow:  ,, as someone who still has issues with 2d printing at times its worrying to see the world moving forward so far  :bawling:


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#24 Relativist

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Posted 26 September 2014 - 05:31 PM

Don't worry Grahaml, 3d printing is just 2d printing in layers. It'll eventually be ready for the masses just like 2d printing. One suggestion, can we print the gears?



#25 PrestonE

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Posted 26 September 2014 - 07:04 PM

Fantastic post!!!!!!!!!!!!

 

I have got to move building the 3D printer higher

up the to do list  :bow:

 

Best Regards,

 

Preston




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