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| Mini lathe transmission replacement |
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| spuddevans:
I think that it is not in keeping with the general atmosphere of this forum to discourage anyone from posting about their experiences and tools, even when they might have caused the problem themselves by ignoring advice given. That being said, Pekka, it might be wise to listen to the advice being offered from many experienced engineers, the last thing we want to see is a picture of you, or anyone for that matter, having recieved injuries because a machine was pushed beyond its capabillities and let go. We all want to be the one who pushes the "envelope" further, to "boldly go where no-one's been before", but let's do it safely. Anyway, that's taken the post off-topic enough, let's get this thread back on track to help the original poster with his questions. Tim |
| Rob.Wilson:
Maybe we should take a look at the forum Rules http://madmodder.net/index.php?topic=4.0 Welcome to the MadModder. This is a place for those who like to build, craft or modify anything and everything can gather. We are going to take our cues from the famous HMEM model engine site. I want this to be a place that fosters ideas and learning... plus a good place to show off your talents and skills. 1. Flaming. Yes we all have different opinions. They can be said without abusing anybody else. We reserve the right to edit or delete posts as we see fit in order to keep the family friendly atmosphere of this site. Remember that although this is a public forum, it is privately owned. We don't like to censor... don't make us do it. Rob |
| doubleboost:
Very well put Rob We need to keep the forum a nice plesant place . I personally have gained a wealth of usefull tips and information ,far more than i have put in. So please lads keep the moderators happy |
| loply:
Evening folks, Midnight! Just finished popping the spindle out of the lathe, couldn't remember how I did it last time so it took a while :hammer: I have decided just to fit metal headstock gears and may add a two-speed intermediate shaft later. Bogs, I appreciate your input and acknowledge all of your points, however... I was turning a 60mm aluminium part and taking very light cuts when the gear broke, and when it broke it completely shattered as you can see. Whether or not I have overloaded it previously to weaken the gear is unknown, but, it would seem that these gears breaking is a continual problem and the positioning of the "fuse" in a place takes hours to reach is one of MANY bad design choices on 7x lathes. When you make reference to users "knowing better" than the manufacturer... Well, it's not a case of knowing better, it's a case of the manufacturer using plastic because it's cheaper. If they were trying to make a better lathe for more £££ I'm sure the gears would become metal pretty quick... Also, in this instance close inspection leads me to think the gear shift fork has engaged with a tooth on the plastic gear (the fork is wobbly as hell and at the right angle can stick its prongs into the teeth), if I'm correct then the thing would have exploded even if no cut was being made, and the solution is to fix the bad shifter design. I'll pop metal gears in there whilst I'm at it, in order to move the 'fuse' to an easier location. The lathe once upgraded is drastically better than stock, so the manufacturer made many bad choices - plastic headstock gears which explode randomly and take hours to replace, saddle jibs which are impossible to set, electronics which are completely vulnerable to the ingress of swarf, etc. In this case, I'm pretty certain I do kow better than the manufacturer. Or rather, I care enough to undo some of his economic compromises! Having said all that, I acknowledge your point and don't intend to turn 7" pieces on this thing, but I do disagree with your implication that replacing cheap plastic gears with metal ones is somehow a bad idea or that I was expecting too much to try to turn 60mm aluminium. |
| loply:
One other small point - I can only speak for myself, but about the only thing I have to make on the lathe is new parts for the lathe!!! I bought the thing for fun and most impotently to LEARN - a few months ago I had never made a metal object in my life, now I have made things with bearings that look like they came from a factory, and have a real appreciation of what works and doesn't, what's critical and isn't, etc. Sure... I could have gone out and put a £3,000 CNC lathe on my MasterCard, but what the hell would I do with it? :bugeye: The hours spent fettling with this lathe are great fun and great for learning and I wouldn't change it for the world. Unless I was trying to manufacture something, in which case I'd get that MasterCard out... :D No point telling a fisherman to go to the supermarket for his fish... |
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