Greetings from Austin Texas Mark. Good to see someone else doing the mini milling machine. Did you ever finish it, and do you plan to do a video on it? I'm neck deep in the same project right now. Good luck and stay well.
I haven't made much more progress yet sadly. I do definitely intend to pick the kit up again and get it finished! Your multiple series one the PM kits are really inspiring as to just how detailed one can go with them!
Hi Mark Just watching another of your video's. Got a Unimat 3 just like yours with mill attachment, Taig/Petrol lathe, Sherline vertical mill, ML Speed 10. Got hooked Model Engineering when doing jobs in U.K. going to shows. P.M R. --- Good Kits Here in U.S. Like your video's Mike G.
Back Again Mark : Just a note As you showed your 1st casting with the 'off - sided hole --- If you have problems with the bush --- Try to contact P.M. I think they will sell you ' seperate castings @ min. $$ ---- Most likely more $$$$$ for shipping Mike G
I don't know anything about machining. But when center drilling at 41 minutes the arm of the casting seemed to be bending down with the down pressure from the drill. Could this have started the hole off on an angle and caused the next drill to be pushed out for the hole in the other arm causing it to be off center as you show at the end? Maybe a turned bit of metal glued between the arms would have added some strength for the drilling operation?
Thanks for the comment! Yes sadly you are correct, there was movement in the part whilst drilling, I believe that this was the main factor in the off centred holes.
Wow, talk about a hard part to hold. Shame about the one hole. If it was mine, I would fill it in with alumiweld (aluminum brazing rod) and re do it. That has saved a few of my projects in the past. Just be carful not to melt the base material. If you’ve never used it before, you’ll need to practice on some scrap, but it’s great stuff once you figure it out. Keep up the great work.
Thanks for the comment. That is a good idea indeed, sadly I don't have a welder or torch capable of this at the moment. Ive decided to bore out both holes to accept a brass bushing instead, this should correct the error.
@@TooManyLathes yup, the brass bushing is a good idea. And maybe easier than mine. But just FYI, you only need a simple map gas or propane torch for alumiweld. It’s actually not welding, but brazing. A lot of people ‘rag’ on it, but it is a handy tool to have on occasion.
Also how come you haven't invested in a set of number drills? Aren't they needed for tapping pretty much any of the smaller holes? Have you been able to get away with using metric drills to get close?
Hi, i have a question about your emco machine. Apparently by design, there is about 3 to 5 thou of axial slop in the milling spindle. Has this been a problem for you? I have the same machine but have not started making any cuts with the milling attachment yet. I measured my axial play to be right at around 4 thou, but honestly, it seems like quite a bit for the cutter to bounce around, have yoi had any problems making decent cuts with this axial play in the spindle of the unimat?
Thanks for the comment! I have noticed that the mill struggles with harder materials due to chatter. Having now had the chance to measure the actual amount of axial play, I believe that this is the main cause of chatter. There is indeed no way to adjust the play in the bearings as I suspected they are indeed just a press fit onto the shaft with a bearing capture plate above to compress the stack together. The only way to adjust play would be to make a jig to hold the spindle and use a hydraulic press to very carefully increase the tightness of the whole spindle stack. I hope this helps.
Greetings from Austin Texas Mark. Good to see someone else doing the mini milling machine. Did you ever finish it, and do you plan to do a video on it? I'm neck deep in the same project right now. Good luck and stay well.
I haven't made much more progress yet sadly. I do definitely intend to pick the kit up again and get it finished! Your multiple series one the PM kits are really inspiring as to just how detailed one can go with them!
Hi Mark Just watching another of your video's. Got a Unimat 3 just like yours with mill attachment, Taig/Petrol lathe, Sherline vertical mill, ML Speed 10. Got hooked Model Engineering when doing jobs in U.K. going to shows. P.M R. --- Good Kits Here in U.S. Like your video's Mike G.
Back Again Mark : Just a note As you showed your 1st casting with the 'off - sided hole --- If you have problems with the bush --- Try to contact P.M. I think they will sell you ' seperate castings @ min. $$ ---- Most likely more $$$$$ for shipping Mike G
I don't know anything about machining. But when center drilling at 41 minutes the arm of the casting seemed to be bending down with the down pressure from the drill. Could this have started the hole off on an angle and caused the next drill to be pushed out for the hole in the other arm causing it to be off center as you show at the end? Maybe a turned bit of metal glued between the arms would have added some strength for the drilling operation?
Thanks for the comment! Yes sadly you are correct, there was movement in the part whilst drilling, I believe that this was the main factor in the off centred holes.
Thank you,very intressting,Regards lennart
Thanks for the comment! Glad you enjoyed it1
Wow, talk about a hard part to hold. Shame about the one hole. If it was mine, I would fill it in with alumiweld (aluminum brazing rod) and re do it. That has saved a few of my projects in the past. Just be carful not to melt the base material. If you’ve never used it before, you’ll need to practice on some scrap, but it’s great stuff once you figure it out. Keep up the great work.
Thanks for the comment. That is a good idea indeed, sadly I don't have a welder or torch capable of this at the moment. Ive decided to bore out both holes to accept a brass bushing instead, this should correct the error.
@@TooManyLathes yup, the brass bushing is a good idea. And maybe easier than mine. But just FYI, you only need a simple map gas or propane torch for alumiweld. It’s actually not welding, but brazing. A lot of people ‘rag’ on it, but it is a handy tool to have on occasion.
Also how come you haven't invested in a set of number drills? Aren't they needed for tapping pretty much any of the smaller holes? Have you been able to get away with using metric drills to get close?
Thanks for the comment! Your assumption is indeed correct, however I will now be investing in a good quality set!
Hi, i have a question about your emco machine.
Apparently by design, there is about 3 to 5 thou of axial slop in the milling spindle. Has this been a problem for you? I have the same machine but have not started making any cuts with the milling attachment yet. I measured my axial play to be right at around 4 thou, but honestly, it seems like quite a bit for the cutter to bounce around, have yoi had any problems making decent cuts with this axial play in the spindle of the unimat?
Thanks for the comment! I have noticed that the mill struggles with harder materials due to chatter. Having now had the chance to measure the actual amount of axial play, I believe that this is the main cause of chatter.
There is indeed no way to adjust the play in the bearings as I suspected they are indeed just a press fit onto the shaft with a bearing capture plate above to compress the stack together.
The only way to adjust play would be to make a jig to hold the spindle and use a hydraulic press to very carefully increase the tightness of the whole spindle stack. I hope this helps.
First 😀
Yes you are! lol Thanks for the comment!