Thread: Chuck back plate

I would knock the taper off the bore and then press fit a piece if you are going to go that way, as it will hold in by itself then.

Dave

Would it be easier to bore that plate parallel and then bush it.
If you intend to use it for a backing plate check the PCD of your chuck incase the holes allready in it interfeer.

Originally Posted by Dave J

I would knock the taper off the bore and then press fit a piece if you are going to go that way, as it will hold in by itself then.

Dave

Hi Dave, so you think it is better to remove the taper altogether ? And use a parallel press in spigot ? BTW that taper is over a 1 and 7/8" length . So is there a mathematical genius among us who can work out the angle ? I can turn down the outside to take a 5" chuck .... that would get rid of the ugly holes in the perimeter MIKE

PS what is the most suitable material for the bush/hub Cast iron ?

I would take out the taper and press fit a piece into it. Even if you lock a taper piece in with locktight etc, there is always a chance of it coming out latter on down the track.
If you are worried about the press fit piece moving, you can drill and tap on the line between the 2 and run a grub screw into it which will lock it in.

Dave

I missed you PS, if you have it around cast iron will be fine, but if you only have steel laying around it will do the job as well.

Dave

Originally Posted by Dave J

I missed you PS, if you have it around cast iron will be fine, but if you only have steel laying around it will do the job as well.

Dave

OK thanks .....

do you want to sell it
aaron

Sorry Aaron..I been out in the shed turning it down..its now had the centre bored out ... The outside is harder than the centre ..funny stuff cast iron . The centre bored out easily, but the periphery is so hard ....blunts a HSS tool in no time . I use a tool straight from the grinder , this works better on cast iron than a tool with a honed edge for some reason , beyond me . MIKE

What speed are you turning the OD.

Originally Posted by pipeclay

What speed are you turning the OD.

I think it is about 250 rpm ..... Mike....PS no its 310 rpm

I would suggest to run it no more than 100 RPM if not at its slowest speed,wasnt it around 6".
I would keep the feed down as well.
It wont hurt to put a little positive rake on the tool if you wish.

Originally Posted by pipeclay

I would suggest to run it no more than 100 RPM if not at its slowest speed,wasnt it around 6".
I would keep the feed down as well.
It wont hurt to put a little positive rake on the tool if you wish.

OK I will try that ..............Thanks

no problem mate not even shore if it was the right one. for me. what sort of lathe do you have?

NO not chips that you eat .... the old back plate has changed shape . Took ages to remove all of that cast iron . I reduced the speed as pipeclay suggested ..did the trick .

I think I will shrink on the hub after I have made it up ..What is the best way to do this ... put the plate in a bowl of water and boil it ? MIKE