MT4.5 sleeve

I have been trying to find a nice cheap MT4.5 to MT2 reducing sleeve without success but have managed to get an MT5 one which has the same outside taper.

if I cannot get the right one, how easy is it to precision grind down the MT5 one by 2mm (diameter) maybe using an MT2 mandrel which I have with centres in each end?

would it be feasible to do this accurately between centres on my Clarkson cuttergrinder rotating the work by hand or does anyone have a cunning power drive solution for that set up?

John

Still unable to find a 4.5 to 2MT sleeve or any firms locally who are able to cylindrical grind it so will proceed to grind it on my Clarkson.

I am planning to make a drive to run on ball bearings on one of the centre spindles with this being belt driven from a geared motor with variable speed control. I hope to make the drive assembly interchangeable with my 5C spin index unit so that I can also use it for simple internal grinding.

I have been unable to find the required rotational speed of the workpiece in my reference books (including Norton book on Toolroom Grinding) or on the 'net, but appreciate that there will not be a single figure due to the multitude of variables. I just need to be in the right ball park.

I have in mind speeds from 20 to 200rpm and a 1/20hp drive motor with either toothed belt or maybe vacuum cleaner flat belt drive running on a crowned drive pulley. (toothed belt might introduce 'tooth pitch' related chatter pattern, flat belt might be prone to slipping under deeper cuts?)

I would appreciate a steer from anyone with experience of cylindrical grinding.

John

Your rotational speed will need to be at the lower end of your suggested range- say 40-100 rpm. Between centres is OK. Don't forget to have the work rotating the opposite way to the wheel. Even if I was doing this on a proper cylindrical grinder in the days when it earned me a crust ,I would not dream of doing it without flood coolant.

Rather than go to all that trouble, have you thought of using a carbide tool and just turning it down - its how I would do it! Good luck anyway.

Rik

Edited By Rik Shaw on 10/03/2019 10:26:49

Here is a drive unit that i made ,toothed belts work fine for these and don't leave a chatter pattern on the work and provide a positive drive.Three speed gearbox and variable speed motor gives a drive speed from 20 to about 700 rpm.

John

John Paton,

I am not sure that the MT5 and MT4.5 tapers are the same. Machinery's Hanbook (30th Edition) states that the taper per foot for morse taper 4.5 is 0.62400 and MT5 is 0.63151. When I made my MT4.5 sleeve (Boxford lathe) I used a MT7 as a gauge, which as far as I know is the only other morse taper which does have the same taper as MT4.5.

Also 2mm to grind is a lot to grind. If it were me I would want to turn away most of that 2mm before the grinding.

I am not sure what they cost but Boxford used to supply MT4.5 to MT3 adapters and MT4.5 to 5C collet adapters, and I think Grizzly in the USA used to sell MT4.5 sleeves as well.

Steve

Gents, what is item 124 on this page.??

Also you could try searching for Harrison M250 spares, (or Colchester Student Mk.3; I think)

Bill

Edited By peak4 on 10/03/2019 13:52:02

Bill,

Item 124 is most likely something other than a MT4.5 sleeve. Your link is to the southbend type of boxford. The X10 is the type with the D1-3 camlock nose bored for a MT4.5.

most likely plus VAT.

Steve

Edited By SteveI on 10/03/2019 14:38:56