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Swinging Arm from the Swinging Sixties! How to Re-Bush, Re-Shim and Refit. BSA Bantam, Classic Bike. 

Retromeccanica
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Welcome to the Channel!
In this video we will be re-bushing, re-shimming and refitting the Swinging Arm on the 1966 BSA Bantam D7. This is a process common to many classic motorbikes.
We will use the workshop press to remove and refit the bushes using a special tool which we made in an earlier video.
We will measure and correct the side-float, manufacturing the appropriate Thrust-Washer on the Maximat Lathe.
Watch out for the snag, caused by my absent mindedness!
I hope you enjoy the video.
Please like and Subscribe if you like what we do.
Best wishes,
Dean.
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7 сен 2024

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Комментарии : 41   
@anthonytilling3442
@anthonytilling3442 Год назад
Awesome stuff dude! I'm an ex Aircraft mechanic and currently buildin a trials bantam that my father (sadly deceased) and I started buildin 30+ years ao! You are very knowleable and inspirational! Many thanks for makin your content!
@retromechanicalengineer
@retromechanicalengineer Год назад
Thanks Anthony. That's very kind of you. I wish you every success with your build. Dean.
@OzBSABantams
@OzBSABantams Год назад
Great work again Dean. I'm with Carl.......Look forward to some screw cutting on the lathe!
@retromechanicalengineer
@retromechanicalengineer Год назад
Cheers Bones, I might screw cut it, we'll have to see how I am for time. It would be more interesting than running a die down it. Best wishes, Dean.
@MrFactotum
@MrFactotum Год назад
eyup Dean Nice one, interesting, i like the rotary gun brush, i've put that in to my grey cells!!!, We used alot of en24T in the mining industry back in the day, that brought back memories atb Kev
@retromechanicalengineer
@retromechanicalengineer Год назад
Cheers Kev, it's certainly good stuff. Those hard nylon brushes are really useful and quite durable. Best wishes, Dean.
@oldguysoldbikes
@oldguysoldbikes Год назад
Being an old farm boy and learning to just get by with what I have, I love watching you and Dale making parts from scratch and getting everything down to within a gnat's hiney. Great work Dean.
@retromechanicalengineer
@retromechanicalengineer Год назад
Thanks Jack. It's long been my dream to have my own workshop and do this kind of thing at home. Glad you enjoyed it. Best wishes, Dean.
@InTheShedUK
@InTheShedUK Год назад
Can't believe they made the swingarm pivot pin with a metric thread! I am sure the ones from Draganfly have the correct 26tpi thread in them. Love the press setup, the things we do to get by. I wonder if a socket on the end of the extension bar would have made it less 'wobbly'. Thanks for the interesting info on materials. I also watch a channel called Dirty Garage Guy from Matt Hudson, he does some good videos on materials amongst other things... If you don't mind some colourful language!
@retromechanicalengineer
@retromechanicalengineer Год назад
I was disappointed to find that thread, oh well, I'll just have to get over it! Thanks for watching Ian. Best wishes, Dean.
@davidwilliamson9162
@davidwilliamson9162 Год назад
If you paint your walls white it really helps to brighten the workshop up,the lighting really kicks in! 👍
@retromechanicalengineer
@retromechanicalengineer Год назад
David, thanks. The other walls are white, I just didn't want to paint the wall of the house in case I decide to carry out building work later on. Best wishes, Dean.
@davidwilliamson9162
@davidwilliamson9162 Год назад
@@retromechanicalengineer I’m doing mine now it’s only taking about a million coats 😂🤦‍♂️
@retromechanicalengineer
@retromechanicalengineer Год назад
@@davidwilliamson9162 yes, it really soaks it up. I used Screwfix own brand masonry paint, it has held up well.
@cainbeeping8480
@cainbeeping8480 Год назад
She is looking good. Most of our bikes are metric. I just bought a m12 bye 1.25 starter tap and bit to drill it Thanks Dean God bless.
@retromechanicalengineer
@retromechanicalengineer Год назад
Thanks mate, the Japanese factories really advanced the metric cause. We are metric for most things, largely excepting roads which are still in miles, yards and MPH. I like to use the thread systems that are standard for the machine but it's a compromise I'll just have to live with.
@cainbeeping8480
@cainbeeping8480 Год назад
@@retromechanicalengineer yep
@AGEngineering
@AGEngineering Год назад
A few things spring to mind here: isn't it amazing that the home workshop can have a hydraulic press these days, a BSA dealer of the time would have used a 4lb sledgehammer, secondly, how posh are you having heating on in the workshop in the UK in 2023, and thirdly, I'm now looking for a cleaning brush for a 30mm autocannon! Great as always, best wishes, Ade.
@retromechanicalengineer
@retromechanicalengineer Год назад
Ade, my BSA service sheet shows the crank being pressed apart with an Arbor Press! It's well established that Grandad's generation were hard as nails. My SIP Fireball is really effective in the little workshop, an extravagance but I try to justify it! Don't get the autocannon brush, get the gas block brush for a....never mind ..You didn't hear it from me! Best wishes, Dean.
@carlwilson1772
@carlwilson1772 Год назад
Great to see you here Ade!
@montana2strokeracer
@montana2strokeracer Год назад
Am I first? Nice job brother. I just love press work, especially when it makes big popping noises.
@retromechanicalengineer
@retromechanicalengineer Год назад
Thanks Dale, you are our Gold Medalist today! I have no regrets from buying the press, it has made so many jobs easier. I may upgrade it with a pneumatic jack like your machine has. Best wishes, Dean.
@montana2strokeracer
@montana2strokeracer Год назад
Not sure I have ever machined 4340, I can see with the inclusion of nickel it would have higher corrosion resistance. I probably would have used 4140 primarily because I have some laying around. I think they might machine about the same. 4140 is hard but the appearance is absolutely beautiful when machined. Great work.
@retromechanicalengineer
@retromechanicalengineer Год назад
@@montana2strokeracer Dale, sounds very much the same, quite tough but you get a silky finish. Best wishes, Dean.
@500dbd34
@500dbd34 Год назад
Hi Dale, just watched your video- re-bushing the swing arm. Very impressed with your knowledge regarding metals and their applications. I bought a large stock of round, square and flat bars from a Tech College a while ago, I don’t know what metal it is but it turns ok. I just tend to grab a piece when I need to make something. I guess I should learn a bit more about metals. Great vid, Cheers B
@retromechanicalengineer
@retromechanicalengineer Год назад
Thanks Brian. I work with materials a lot in my day job, so that's where most of it comes from. It's something that interests me so it comes out in the videos. Thanks for the kind words, best wishes, Dean.
@carlwilson1772
@carlwilson1772 Год назад
I enjoyed every second of that. The analysis of what material to use to make the pin was fascinating. Are you going to screw cut the M12 x 1.25 threads in the lathe? I'm looking forward to the making of those. Great to see Ted in the workshop. Love to all of you from all of us.
@retromechanicalengineer
@retromechanicalengineer Год назад
I'm glad you enjoyed it. Analysis of failure is a big part of my job so I thought I would bring it to the channel. I've ordered a die for the threads but I could have cut them. I might even have a 1.25 pitch insert. Edward was a big help, I love it when the boys spend time with me in the workshop. Hopefully the materials will arrive soon. Best wishes, Dean.
@carlwilson1772
@carlwilson1772 Год назад
@@retromechanicalengineer If you haven't got a 1.25 insert, I have and I will send it to you.
@cainbeeping8480
@cainbeeping8480 Год назад
Well I made it LOL. 👍
@retromechanicalengineer
@retromechanicalengineer Год назад
Always glad to see you Cain.
@chrisstephens6673
@chrisstephens6673 Год назад
What's the point of a workshop if you don't make things? Go for it, even if it is just for the exercise. Two points come to mind though, I have not checked a pin but would have thought it would be in the 50- 55 rockwell C about twice the 24t hardness. The other is the size consideration, it is not the bushes you need to worry about but the hole through the frame which is set if you, or next owner, want to use a standard one in the future. On size/finish can be done with a simple lap rather cylindrical grinding, which neither of us have. I remember reading somewhere that prewar they only had/used three steels for bikes, a mlid steel, a medium carbon like EN8 or what ever they called it before the wartime emergency number system, and a case hardenable steel. ATB C PS bummer on the bolt front. PPS Just to massage my ego, if you know someone who has the Jampot journal you can read up on me. I haven't read it yet, so take it with a pinch of salt.
@retromechanicalengineer
@retromechanicalengineer Год назад
Hey Chris, I really do not see why it needs to be hardened to such a level, I think a lot of the time it was just assumed to be required. Perhaps they anticipated a lack of maintenance. It's a compromise, but not greatly detrimental I don't think. My TRX850 swinging arm ran on a much lesser material and it came off an ex- BOTT race bike! I'm sure that I can get it to a good enough tolerance to be a good fit in the frame, machined between centres. I wouldn't want to risk opening out the diameters in the frame, for the reasons you suggest. It was a bugger about the bolts, it will teach me to pay better attention in future. I don't know anyone who receives to the Jampot magazine but if you would like to email the article I would certainly read it. Thanks for taking the time to watch and comment, best wishes, Dean.
@chrisstephens6673
@chrisstephens6673 Год назад
In truth for expected use, and knowing you will regularly grease it, mild steel would probably last well enough. You could just run a file on the old pin to assess its hardness.
@carlwilson1772
@carlwilson1772 Год назад
@@chrisstephens6673 He wasn't talking about using mild steel.
@chrisstephens6673
@chrisstephens6673 Год назад
@@carlwilson1772 yes I know, I was just making the point that for his expected use even mild steel would work, not that I would advocate it by any means. From memory, and it's at least 20 years since I last touched one, they were harder than the EN24T in as supplied form, which is why I suggested a rough hardness test on the old one with a file. It all boils down to the original comment that he mentioned, it's really not that much more extensive to buy rather than make, considering all the parameters involved. They are accurately sized in order to fit the frame bore and precision costs time and money. Having said all the above I would probably make one myself just for the practice and challenge.
@BritanniaMotorcycles
@BritanniaMotorcycles Год назад
Don't you just love three handed jobs.
@retromechanicalengineer
@retromechanicalengineer Год назад
I think I need to deploy the Apprentice more often Michael!
@ronr6605
@ronr6605 Год назад
Like 7000 years after the first mechanic invented the wheel, the mankind still didn't adapt our genome giving us a 3rd hand. Hubris dreaming of colonizing the stars. ^^
@retromechanicalengineer
@retromechanicalengineer Год назад
@@ronr6605 if it involves holding an item in the press whilst trying to pump the handle, I wouldn't rely on me!
@ronr6605
@ronr6605 Год назад
@@retromechanicalengineer I feel your pain. My man cave life is filled with this moments of curses, prayers and jealousy (towards Kali), since my apprentice (which I wholeheartly love, well not that much in the garage) continuously misreads my thoughts or misunderstands my words (like: no hun, the other left around!). ^^
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