Andrew, just a thought for the future if making more pistons. You had such a long length sticking out of the collet and you machined a long length to size to make 2 pistons. You were extremely lucky that the parting tool did not grab and throw the rest of the bar out of true when doing the first one. I suggest next time only have enough sticking out for the first one and part off, them pull out more bar and do the second one. I know that it woukd mean 2 lots of turning to diameter, but you would get a better finish with less stickout. If you had had a parting tool jam, you would have needed to redo the turning operation again anyway. The other option would have been to use a revolving center, you were hollowing out the end anyway so you would have needed a center drilled hole. Regards from Australia.
Hi Dave - good advice as always. I tend to use an ER32 collet chuck on the lathe which, unfortunately, didn't allow the bar to pass through. I should have swapped it for a 3-jaw chuck. I got away with it though 😀 Cheers Andrew
Your explanation of O ring fitting was really helpful. I have never known what the right fit is. As ever your honesty when things go wrong is greatly appreciated. We all have those moments and it is always interesting to see solutions. I have not even been able to start building a workshop at the new house so I am enjoying getting a vicarious engineering hit via your videos for now.
Thanks Tim. I'm sure others have different views when it comes to o-rings but this method seems to work fine (famous last words). I hope you make good progress with your workshop build. Cheers Andrew
Hi Phil. All good thanks, hope you are too. I'm tied up with diy projects around the house at the moment and also got sidetracked trying to download weather images from passing satellites. I like challenges! The Hoglet is a real fun 'show and tell' engine. From memory it's a fairly straightforward build and a good entry into twin cylinder engines if you haven't made one before. Good luck. Andrew
Hi Andrew, hats off to you for your perseverance and getting over mistakes and finding solutions without having to start over. I must have wasted half my model making life resurrecting mistakes and finding solutions anyway im getting much better at it. After 7 years at it and looking at my first model and comparing it with where I am and what I produce today is very satisfying. I’m making Jerry Howells Powerhouse currently and hope to finish this year.
It happens to all of us. With an engine that I’m building now I did the same thing with the piston and being a new machine discovered that I needed to go farther to get the backlash out of it. That was a culprit for me anyway. I wasn’t taking all the backlash out. I have been machining since I was a young man and I’m in my 60s. So live and learn. Coming along nice Andrew looking forward to the next video.
Yeah - I could have kicked myself. I find that most of my mistakes are made towards the end of the day - when I've done loads of machining. Sometimes I should just finish early and start with a fresh head the next morning. Hey ho!
@@learningturningmetal Always at the end. But then again, do the mishaps always occur at the end of the day, or does the day end after the mishap? ( both a bit I guess!)
Happens to us all Andrew. I've been going through a bad patch of mistakes recently. The pistons turned out fine in the end anyway. Looking forward to the next bit. ATB Nobby
Hi. I use Fusion360. It's an amazing professional CAD CAM package. It's free to hobbyists with some minor limitations. Learn 2D first and the 3D will just flow from there. The CAM is brilliant too. As I recall it's a bit fiddly getting the free license but well worth a little bit of hassle. Cheers Andrew
Hi Ernie Thanks for enquiring. I'm good, just been tied up on DIY stuff and other things. One thing leads to another! I've just started on the cylinder heads, so my next video should be up soon. I must get back into the groove of model engineering! All the best. Andrew
Splendid save with the misdrilled holes Andrew. Would it have made a great difference leaving them open as they would have been behind the rings? Maybe helping reduce the mass of the pistons?
Thanks Earl. I really wasn't sure if those holes would have caused any problems going forward. Bearing in mind my engines never run first time, it would always be in the back of my mind that is was causing an issue. All the best. Andrew
We all make mistakes mate. When you drilled the cross hole It's best to turn the piston and leave some stock bar on it and that way you have more to hold onto without marking the O/D of the piston and then you can part it off after.
Andrew, just a thought for the future if making more pistons. You had such a long length sticking out of the collet and you machined a long length to size to make 2 pistons. You were extremely lucky that the parting tool did not grab and throw the rest of the bar out of true when doing the first one. I suggest next time only have enough sticking out for the first one and part off, them pull out more bar and do the second one. I know that it woukd mean 2 lots of turning to diameter, but you would get a better finish with less stickout. If you had had a parting tool jam, you would have needed to redo the turning operation again anyway. The other option would have been to use a revolving center, you were hollowing out the end anyway so you would have needed a center drilled hole. Regards from Australia.
Hi Dave - good advice as always. I tend to use an ER32 collet chuck on the lathe which, unfortunately, didn't allow the bar to pass through. I should have swapped it for a 3-jaw chuck. I got away with it though 😀
Cheers
Andrew
Your explanation of O ring fitting was really helpful. I have never known what the right fit is. As ever your honesty when things go wrong is greatly appreciated. We all have those moments and it is always interesting to see solutions. I have not even been able to start building a workshop at the new house so I am enjoying getting a vicarious engineering hit via your videos for now.
Thanks Tim. I'm sure others have different views when it comes to o-rings but this method seems to work fine (famous last words). I hope you make good progress with your workshop build.
Cheers
Andrew
Excellent option to the rings, I will consider this as a option for mine.
Another well produced video.
Thanks Jim!
Hi Andrew. Hope you are well looking forward to your next video. I am just about to start on the hoglet. All down to your series of videos
Hi Phil. All good thanks, hope you are too. I'm tied up with diy projects around the house at the moment and also got sidetracked trying to download weather images from passing satellites. I like challenges! The Hoglet is a real fun 'show and tell' engine. From memory it's a fairly straightforward build and a good entry into twin cylinder engines if you haven't made one before.
Good luck.
Andrew
Hi Andrew, hats off to you for your perseverance and getting over mistakes and finding solutions without having to start over. I must have wasted half my model making life resurrecting mistakes and finding solutions anyway im getting much better at it. After 7 years at it and looking at my first model and comparing it with where I am and what I produce today is very satisfying.
I’m making Jerry Howells Powerhouse currently and hope to finish this year.
The Powerhouse should be an interesting build. It's all good fun and amazing what can be achieved in a small home workshop. Good luck!
Andrew
It happens to all of us. With an engine that I’m building now I did the same thing with the piston and being a new machine discovered that I needed to go farther to get the backlash out of it. That was a culprit for me anyway. I wasn’t taking all the backlash out. I have been machining since I was a young man and I’m in my 60s. So live and learn. Coming along nice Andrew looking forward to the next video.
Yeah - I could have kicked myself. I find that most of my mistakes are made towards the end of the day - when I've done loads of machining. Sometimes I should just finish early and start with a fresh head the next morning. Hey ho!
@@learningturningmetal Always at the end. But then again, do the mishaps always occur at the end of the day, or does the day end after the mishap? ( both a bit I guess!)
Happens to us all Andrew. I've been going through a bad patch of mistakes recently. The pistons turned out fine in the end anyway. Looking forward to the next bit. ATB Nobby
Thanks Nobby!
Hi, The "offset" holes were to give clearance to the cylinder wall, ha ha. thanks for the video. cheers John
Gday Andrew, is class the extra holes are for weight reduction😉, nice work mate
Ha ha Matty. Yeah I think I'll have a go at drilling some more!
All the best.
Andrew
I am sure they will be ok. Like you said the piston is open at the bottom anyway.
Steve.
Cheers Steve!
Great video Andrew. Can you tell me what drawing package you’re using. Thanks
Hi. I use Fusion360. It's an amazing professional CAD CAM package. It's free to hobbyists with some minor limitations. Learn 2D first and the 3D will just flow from there. The CAM is brilliant too. As I recall it's a bit fiddly getting the free license but well worth a little bit of hassle.
Cheers
Andrew
Hi Andrew, are you OK, not heard owt from you for a while 👍🏴
Hi Ernie
Thanks for enquiring. I'm good, just been tied up on DIY stuff and other things. One thing leads to another! I've just started on the cylinder heads, so my next video should be up soon.
I must get back into the groove of model engineering!
All the best.
Andrew
Splendid save with the misdrilled holes Andrew. Would it have made a great difference leaving them open as they would have been behind the rings? Maybe helping reduce the mass of the pistons?
Thanks Earl. I really wasn't sure if those holes would have caused any problems going forward. Bearing in mind my engines never run first time, it would always be in the back of my mind that is was causing an issue.
All the best.
Andrew
Hi Andrew, I was thinking about the mis drilled holes, I think thy would just help lubricate the cylinder.
Rich
Yep wouldn’t have hurt a thing being below the piston ring.
An interesting thought Rich. Maybe I've accidentally come upo with a new piston design! 🤣🤣
Cheers
Andrew
We all make mistakes mate. When you drilled the cross hole It's best to turn the piston and leave some stock bar on it and that way you have more to hold onto without marking the O/D of the piston and then you can part it off after.
Fair point Dermot.
Cheers
Andrew
that sucks 🙂
cheers ben.