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 Sekim Diesel Progress

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Sekim



Location : York England

PostSubject: Sekim Diesel Progress   Thu Apr 17, 2014 3:10 pm

Hi. Iíve now got most of the bits together that I need and have made a start. I found a steel 40T mod 1 gear at http://www.technobotsonline.com and instead of moding the acetal gear to fit on a flywheel Iíve made a complete flywheel from the steel gear. †Ratio †is 14:40.
http://i1029.photobucket.com/albums/y357/Sekim7/imagejpg1_zps64978cde.jpg
The original drive collet is a tight fit in the rear of the gear which has been thinned from 15 to 10 thick to suit the pinion.† The split collet reqd to hold the gear is shown at top of pic. The centre hole was 10 dia so a tube/sleeve nut was made from a close fitting 10 bolt tapped M5 to match the crankshaft.
http://i1029.photobucket.com/albums/y357/Sekim7/imagejpg3_zps633854b5.jpg
Flywheel fitted to Force 15 motor.
http://i1029.photobucket.com/albums/y357/Sekim7/imagejpg4_zps0d3c07ef.jpg
Iíve today started on the RC timer brushless motor. This was harder to strip than I anticipated as it was loctited together.† This only became obvious after I had taken the head out of one allen screw!!††A little gentle heat on the other one and the shaft allowed disassemble after drilling out the damaged screw. †The intention is to fit a slightly longer shaft to carry the pinion.
Regards† Mike
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Saint-Oblas



Location : Lyon, France

PostSubject: Re: Sekim Diesel Progress   Fri Apr 18, 2014 8:51 am

I had the same problem with the RC timer BLDC. It is better to know before spoiling the allen screw head! Drilling this rather hard screw out of an aluminium part is an hasardous operation for who does not own a suitable tool.

I had a problem with RCtimer: the dimensions they give on their site is not at all reliable; for my motor the loverall length was suppose to be 18.5 mm and is actually 21.5. The holes on the stator are supposed to be on a 20mm circle: in fact two are, the other two are on a 16mm circle. I hope the Kv are more reliable; otherwise I am in a mess.
In fact surprisingly enough model suppliers do not seem to be very concerned with dimensions! I found three different values on a servo thickness on the same internet page: one in the description, one in the dimensions table and a third on the diagram! Difficult to build a correct design in such conditions!
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Carl Hibbs
Admin


Location : Haute Normandie - visitors welcome

PostSubject: Re: Sekim Diesel Progress   Fri Apr 18, 2014 11:37 am

That's†odd as I haven't had any problems with these allen screws..... so far. The shafts are indeed a tight fit and need to be tapped out.

That's an interesting way to go, with making the flywheel the gear. I'm following the progress!
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dewintondave



Location : New Zealand

PostSubject: Re: Sekim Diesel Progress   Sun Apr 20, 2014 7:19 am

Excellent.† Nice gears.

Best wishes,
Dave.

_________________
All my garden railway videos on YouTube: https://www.youtube.com/user/dewintondave
I am now posting images on Instagram: #LiveDiesel
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https://www.youtube.com/user/dewintondave
Sekim



Location : York England

PostSubject: Re: Sekim Diesel Progress   Fri Apr 25, 2014 5:44 pm

Hi, more progress made and most of it satisfactory.† I mocked up in cardboard the outline of ďHarlech CastleĒ at 16mm-1í, to check that the engine and brushless motor would fit.† Deciding they would I then made up a new 5 dia extended shaft for the motor and a sleeve for the pinion, which is 6 bore.
http://i1029.photobucket.com/albums/y357/Sekim7/6_zps3f32dce6.jpg http://i1029.photobucket.com/albums/y357/Sekim7/7_zps7bddde27.jpg
The motor mount is 10 thick aluminium and after reasonable care was taken to get the two gears at the correct centres I had to resort to a shim under the vertical part to get a running clearance.
http://i1029.photobucket.com/albums/y357/Sekim7/9_zpsb294e6f9.jpg
http://i1029.photobucket.com/albums/y357/Sekim7/11_zps8bcef8e8.jpg
http://i1029.photobucket.com/albums/y357/Sekim7/12_zpsd5a977ff.jpg
I was pleasantly surprised to find the motor easy to start even when directly driving the brushless motor.† At tick over it produces just under 8v and a few more revs, by adjusting the idle screw alone, easily produce just under 12v.† The steel gears are 40 driving 14 (2.86:1) and are initially pretty noisy, but may bed in.† The acetal gear would have been quieter, but more difficult to mount on a flywheel.† Just need a chassis and body now!!!
http://i1029.photobucket.com/albums/y357/Sekim7/13_zps9e1038ed.jpg
http://i1029.photobucket.com/albums/y357/Sekim7/14_zps9ebd8d42.jpg
Regards Mike
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PostSubject: Re: Sekim Diesel Progress   Today at 6:55 am

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