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Messages - MakkyBrown

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1
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 20, 2019, 10:04:02 PM »
Flash or anyone, how many mm of oscillation do I need ?

2
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 20, 2019, 09:44:53 PM »
Flash, I'll let you know how much run out I get from my cheap $7 ER11 adapter when it arrives. :)

Giel, Nice little lathe, bit of a bargain for the $$.

3
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 16, 2019, 06:18:14 PM »
Just been thinking, oscilation might be nicer on a feed screw.  Using endstops for safely and homing and an arduino+motor driver to reverse direction and control the speed and thus do nice slow down transition as it changes direction. And I just happen to have another motor from the printer with an encoder on it.

And I just purchase one other those collet holders for my little printer motor.  ::) , no I'm not going to build one.   :-\ maybe.........


4
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 16, 2019, 10:26:35 AM »
Yeah, nice idea. I'll been doing a similar thing to this on my new faceting machine to drive my index/quill. But on a smaller scale and making it myself.  They are pretty expensive brackets though but look pretty accurate.
Have you seen these
https://www.aliexpress.com/item/57-stepper-motor-bracket-nema-23-fixed-seat-connecting-seat-support-seat/32821387669.html?spm=2114.10010108.1000014.1.152543128OUBnL&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.106568.000000000000000&scm_id=1007.13338.106568.000000000000000&scm-url=1007.13338.106568.000000000000000&pvid=18b8900f-acb4-4050-8e56-f30689f2cd71
https://www.aliexpress.com/item/CNC-NEMA-23-Stepper-Motor-Accessories-Mounts-Bracket-Support-Shelf-nema23-Stepping-Motor-For-57-Motor/32960143402.html?spm=2114.search0104.3.106.172b4bebxCxMT2&ws_ab_test=searchweb0_0,searchweb201602_10_10065_10068_10130_10547_319_317_10548_10696_453_10084_454_10083_10618_10307_537_536_10131_10132_10902_10133_10059_10884_10887_321_322_10103,searchweb201603_55,ppcSwitch_0&algo_expid=e278efb4-2513-43ec-b0ab-08a9845ff413-16&algo_pvid=e278efb4-2513-43ec-b0ab-08a9845ff413&transAbTest=ae803_4
Maybe you could make your own bearing holder with adjusters to line up perfectly.

I think one bearing but good quality.
But you could still go the simplest option and just adapt straight to the motor shaft. It is 8mm and there are a good few replacement motors in the cost of the bracket/bearing.https://www.aliexpress.com/item/ER11-ER16-ER20-C16-C20-C25-Motor-Shaft-Extension-Rod-Spindle-Collet-Lathe-Tools-Holder-Inner/32968409344.html?spm=2114.search0104.3.1.68cf6b7d2uLnSe&ws_ab_test=searchweb0_0,searchweb201602_10_10065_10068_10130_10547_319_317_10548_10696_453_10084_454_10083_10618_10307_537_536_10131_10132_10902_10133_10059_10884_10887_321_322_10103,searchweb201603_55,ppcSwitch_0&algo_expid=3745efe0-ef3f-4ed1-ac3f-c836df7e5e3d-0&algo_pvid=3745efe0-ef3f-4ed1-ac3f-c836df7e5e3d&transAbTest=ae803_4



5
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 15, 2019, 10:25:32 PM »
 8) what motor driver did you get? Did you go with theirs or a cheap one off ebay? You should be happy with that motor if it's the same quality as their steppers. And a massive 8mm shaft :)
Looking very flash with the digital readouts.

6
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 12, 2019, 08:27:13 PM »
Delron is nice I've used it a bit. It has to take all the side to side movement of the hand piece and I was thinking bearings would be smoother.
Solved, i'm going to recess a couple of thrust bearings.

7
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 12, 2019, 09:36:28 AM »
Delron is nice I've used it a bit. It has to take all the side to side movement of the hand piece and I was thinking bearings would be smoother.

8
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 11, 2019, 08:53:36 PM »
In this clip you'll see the Polymetric Scintillator 88 mast/faceting head on the concave machine etc. (at roughly 28-33 seconds) What I would like to know is how have they setup the bearings for the horizontal pivot on the mast. Any ideas?? I want to use a pivot like that but it's hard to figure out which bearings especially the rubbish I recently got from china. I'm a bit lost for ideas that will be rock solid and precise. Maybe I'll have to use tapered roller/cone bearings.

https://www.youtube.com/watch?v=Q1oBOCm0V-o
https://www.polymetricinc.com/home_htm_files/76.jpg

CheersMB

9
Gemstone Faceting / Re: TV glass toxicity?
« on: February 10, 2019, 08:43:07 AM »
Thanks OP, a sad tale.

10
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 08, 2019, 11:58:20 AM »
Hi Giel,

I dont have the specs on gand, but the more info tab under the picture of the motor on Banggood gives these specs.

Torque is also a function of motor speed, so you need one with good torque for cutting at low speeds.

Noise will also be a factor.  Motors for battery drills are quite noisy, too noisy for faceting.

The worm wheel drives the output shaft of the gearbox.  On my gearbox the shaft is 6mm od with a flat.  I drilled a 6mm hole in the end of a 10x10x60mm piece of mild steel, rotated 90 deg and drilled an offset hole for a tightening screw and split the end so it looks a bit like a battery terminal. 

Next time I wont do this, it requires too much pressure to clamp the arm to the shaft. Instead I'll just drill and tap a hole in the end, so I can screw a bolt straight down onto the flat on the shaft.

Then I split the rod so ut was 5mm wide except for the end with the hole, it stays as a 10x10x10mm bloc, and drilled and tapped 3 holes for 5mm bolts at, 15mm, 20mm and 25mm from the centre of the 6mm hole. These are mounting holes for the 5mm tie rod ends I use as a shaft.   They give a throw of 30  40, and 50mm respectively.

The tie rod ends are from Banggood, 1 male and 1 female + a tightening nut so I can adjust the length and position the end point of the oscillation.  They have a swivvel bearing at their end.

Makky,
I'm wondering if bush bearings would be better than ball bearings when accuracy is required,  a small amount of oil on the bearings would remove the play.

Motion Dynamice make
Given the quality and play in some of the ball bearings I have purchased from China maybe. Generally in these little motors I think the ball bearings give a longer service life. Some of the smaller dc motors we have purchased with brass bearings have a very short service life, like 150hours from their datasheets. The front ball bearing in your 775 is good imo.
I suppose the next step up would be a motor like the printer motor I have where there is preload between the front and rear bearings and a service life of thousands of hours.

11
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 07, 2019, 08:39:05 AM »
I think I found a motor similar to the OMF one on Aliexpresss yesterday, just can't find it again for you.


I had a look at the 775 motors. They have a ball bearing on one end, I noticed an 895 motor in the same listing with ball bearing both ends and slightly lower rpm. Other 895 have bearing on one end. This listing has some info.

https://www.aliexpress.com/item/885-DC-motor-12-24V-high-torque-895-high-speed-motor-high-power-bench-drill-electric/32880222654.html?spm=2114.search0104.3.127.422670435BOALY&ws_ab_test=searchweb0_0,searchweb201602_5_10065_10068_10130_10547_319_317_10548_10696_453_10084_454_10083_10618_10307_537_536_10131_10132_10902_10133_10059_10884_10887_321_322_10103,searchweb201603_55,ppcSwitch_0&algo_expid=d874a36f-0cfe-4ca5-a6d8-f625edc03b9b-18&algo_pvid=d874a36f-0cfe-4ca5-a6d8-f625edc03b9b&transAbTest=ae803_4

Found theses search MY6812 on Ebay and AliexpressThis link describes the motor and how to remove the pulley.
https://www.motiondynamics.com.au/united-my6812-12v-dc-100w-2750-rpm-electric-motor.html
8mm shaft, low down torque being a bike motor, runout no info.

And lastly I wonder if end play is important due to the motor being oscillated.That printer motor I have had preloaded end play.

12
Gemstone Faceting / Re: TV glass toxicity?
« on: February 06, 2019, 10:33:11 PM »
lol, I didn't even know there was uranium glass. So google it..once made into tableware.

https://en.wikipedia.org/wiki/Uranium_glass

13
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 06, 2019, 10:28:08 PM »
Flash, With my limited electrical knowledge I did realize there was a difference. I thought it would just run slower at 50Hz.I'm not planning to buy it just posted it as a possibility.

CheersMB


14
Gemstone Faceting / Re: TV glass toxicity?
« on: February 06, 2019, 06:01:43 PM »
Cut 3 very nice stones from TV glass and haven't died yet, despite the Avatar name.

Regards,
Ghost.
I reckon you'd be pretty safe with 3 stones. I think it's more of a long term thing where it accumulates. I was reading one study measuring the rates of leaching out of different types of tv glass as there are concerns about it in land fill. Cutting or grinding the glass would have to increase the rate. Could just wear a glove but I'm not going to cut leaded glass myself.


15
Gemstone Faceting / Re: choosing the right electromotor, please help.
« on: February 06, 2019, 04:04:57 PM »
I wouldn't worry about your run out flash. Just use lower rpm and faster osculation. That ultratech worked ok with run out.


Just came across this motor.https://www.ebay.com.au/itm/M315-402-Continuous-Duty-Operation-Speed-Control-Motor-AC-220V-15W-1-5uF/301739437903?hash=item4641126f4f:g:fk8AAOSw~vpaSivb

 

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