Boring the MT2 on spindle

[MWParticipant @mw27036]

Not really sure how the MT reamer can wander if it's following a pre-determined path by the roughed out shape? Surely it will cut relative to bored/tapered hole that's already there?

Besides which, your tail stock has got to be near enough bang on in the first place, otherwise you'd notice all those off centre holes you've been drilling. 

Michael W

Edited By Michael-w on 17/11/2017 21:24:40

[sean logieParticipant @seanlogie69385]

Posted by mark smith 20 on 17/11/2017 16:25:44:

I would think it better if Sean kept everything in one thread as he has 2-3 threads concerning the spindle /vertical head for his Centec .

It would certainly avoid confusion. Come on Sean do a quick sketch doesnt have to be anything fancy, as i am interested in how your doing it .

Edited By mark smith 20 on 17/11/2017 16:26:09

I tried doing a drawing using some crap download I found , had it all done and the bloody thing wouldn't let me do anything with it 😥

I will keep everything spindle related to this thread from now on …. Feel like I'm being watched now ….. Just remember I'm a newbie to this and some of the terminology has me stumped , please try and keep things simple 😁

 

Sean

Edited By sean logie on 17/11/2017 21:16:43

Edited By sean logie on 17/11/2017 21:17:16

[sean logieParticipant @seanlogie69385]

Posted by John Haine on 17/11/2017 14:20:12:

On the right is the taper plug – the centre drilling is at the other end. On the left is a double-ended MT2 arbor I made. One end was turned to a taper and carefully fitted to the h/s socket in my lathe; then the whole thing turned round and fitted back in lathe taper with a drawbar to hold it while the other end was also turned to MT2, with another drawbar socket. I made this to allow making a short spindle, with an MT2 socket made in it, to be mounted to have its o/d turned concentric with the taper. You are welcome to borrow either or both of these, I don't suppose they would otherwise get used.

It strikes me that using the type of arbor shown above could be difficult as it is surely hardened and ground. You can buy MT2 sleeves with parallel outsides, which you can loctite into a parallel bore in your spindle – I think RDG or Arc have these.

If this is a milling spindle, you could be outrageous and not have an MT2 taper at all! Why not make the end to fit an ER25 or 32 collet? Then you only have to make a short taper, which is quite easy, I've made both ER25 and ER16 tapers that work fine. Or bore a parallel hole and loctite an ER25 or 32 straight shank collet chuck into it. There have been plenty of postings here on why Morse tapers are not the best for a milling spindle.

 

Food for thought John ….

I have ER32 collets along with mt2 collets . A ER32 on a spindle makes sense and would be so much more compact compared to using a ER32 on a mt2 taper . Maybe a change of plan 😋.

 

Sean

Edited By sean logie on 17/11/2017 22:21:18

[not done it yetParticipant @notdoneityet]

you'd notice all those off centre holes you've been drilling.

Not necessarily. An off centre drill might just drill a bigger hole.  Think here that boring bars don't bore off centre holes.

 

Edited By not done it yet on 17/11/2017 23:12:12

[mark smith 20Participant @marksmith20]

Posted by sean logie on 17/11/2017 21:13:33:

Posted by mark smith 20 on 17/11/2017 16:25:44:

I would think it better if Sean kept everything in one thread as he has 2-3 threads concerning the spindle /vertical head for his Centec .

It would certainly avoid confusion. Come on Sean do a quick sketch doesnt have to be anything fancy, as i am interested in how your doing it .

Edited By mark smith 20 on 17/11/2017 16:26:09

I tried doing a drawing using some crap download I found , had it all done and the bloody thing wouldn't let me do anything with it 😥

I will keep everything spindle related to this thread from now on …. Feel like I'm being watched now ….. Just remember I'm a newbie to this and some of the terminology has me stumped , please try and keep things simple 😁

Sean

Edited By sean logie on 17/11/2017 21:16:43

Edited By sean logie on 17/11/2017 21:17:16

Not being watched Sean just interested, im a relative beginner myself to anything id call precision machining.

I tend to jump right in with some difficult (to me at least project) and sometimes surprise my self and other times make a right balls up of it.

[sean logieParticipant @seanlogie69385]

Posted by mark smith 20 on 18/11/2017 00:15:47:

Posted by sean logie on 17/11/2017 21:13:33:

Posted by mark smith 20 on 17/11/2017 16:25:44:

I would think it better if Sean kept everything in one thread as he has 2-3 threads concerning the spindle /vertical head for his Centec .

It would certainly avoid confusion. Come on Sean do a quick sketch doesnt have to be anything fancy, as i am interested in how your doing it .

Edited By mark smith 20 on 17/11/2017 16:26:09

I tried doing a drawing using some crap download I found , had it all done and the bloody thing wouldn't let me do anything with it 😥

I will keep everything spindle related to this thread from now on …. Feel like I'm being watched now ….. Just remember I'm a newbie to this and some of the terminology has me stumped , please try and keep things simple 😁

 

Sean

Edited By sean logie on 17/11/2017 21:16:43

Edited By sean logie on 17/11/2017 21:17:16

Not being watched Sean just interested, im a relative beginner myself to anything id call precision machining.

I tend to jump right in with some difficult (to me at least project) and sometimes surprise my self and other times make a right balls up of it.

My attitude for this project is …. I have plenty more material .don't get me wrong I'd like to get it first attempt .My biggest problem is that I tend to overthink thing ,then I stall out .

 

Edited By sean logie on 18/11/2017 06:02:04

[nigel jones 5Participant @nigeljones5]

Having just paid £35 for a decent mt2 reamer I now see a better solution to rejuvenating my knackered 50 year old tailstock taper – bore it out to 1" and heat shrink in one of the mt2 sleeves mentioned above. Thanks

[MWParticipant @mw27036]

Posted by sean logie on 18/11/2017 06:00:52:

.My biggest problem is that I tend to overthink thing ,then I stall out .

 

I think it's far more common than you tend to realize, you can only cut it once and then it's gone. So you don't want to mess up.

I always keep in mind the expression of the late Joe Martin, CEO of Sherline;

"I never knew anybody who messed something up by taking too light a cut"

​​Now we can all just go listen to some nice jazz and spend the rest of the day chilling out about it. 

Michael W

Edited By Michael-w on 18/11/2017 13:07:34

[sean logieParticipant @seanlogie69385]

Chilling out is the theme for the whole weekend, my wife and I are caravaning in Grantown on Spey . Been making a wish list of my next tool/tooling 😉

Sean

[sean logieParticipant @seanlogie69385]

What type of steel do you guys suggest for the spindle .

And … should I go mt2 taper or er32 for the spindle .

Sean

[John HaineParticipant @johnhaine32865]

If you make it MT2, I suspect that you will soon be asking us "should I get an ER25 or ER32 collet chuck for my milling spindle?". So why not just go ER32 straight off? Apart from anything else…

1. You will save about 50mm of headroom under the mill head that otherwise would be taken up by the projecting part of the collet chuck.
2. ER32 collets can cover the full size range so you can also hold drills with the same benefit of more headroom (especially true compared with fitting a drill chuck).
3. The cutter will be more rigid with less overhang.
4. You won't have to knock the end of the drawbar to release the MT2 taper when it gets stuck!

For a milling spindle, unless you have loads of MT2 tooling from the lathe that you want to also use in the mill, there seems to me to be no benefit in MT2 and loads of disadvantages.

[JasonBModerator @jasonb]

But then again you won't be able to use any other type of MT tooling such as Boring head, Flycutter, saw & cutter arbors, etc unless you have then on less rigid parallel shanks that will have to go into the ER collet and therefore stick out more and could risk run out problems by the time you add up TIR of ER spindle, collet and tool.

Also you WILL have to bore the ER taper correctly as you can't get reamers for that!

Edited By JasonB on 19/11/2017 15:14:40

[sean logieParticipant @seanlogie69385]

Dam…… I shouldn't have asked that bloody question …

 

Which steel to use ? 

 

Sean 

Edited By sean logie on 19/11/2017 15:37:35

[mark smith 20Participant @marksmith20]

Still curious how you intend powering the spindle /head??

[sean logieParticipant @seanlogie69385]

Posted by mark smith 20 on 19/11/2017 16:09:00:

Still curious how you intend powering the spindle /head??

I have no clear ideas as of yet ,I may try and use the nose of the horizontal spindle .

Like this

[mark smith 20Participant @marksmith20]

is there any reason why you cant use an actual er32 spindle as a spindle . I was toying with the idea for something i was gonna make , as they are available with a straight shank up to 40mm , and up to 150-200mm long . The 40mm just happens to sort of fit the common taper roller bearings used in many mini mills etc… ie.. 62mm outside and 40mm id.

I did buy one from apt for around £20-25 and the quality is good ,though they have a flat on one side unfortunately.

**LINK**

Just another of my daft ideas.

[sean logieParticipant @seanlogie69385]

Posted by mark smith 20 on 19/11/2017 16:47:44:

is there any reason why you cant use an actual er32 spindle as a spindle . I was toying with the idea for something i was gonna make , as they are available with a straight shank up to 40mm , and up to 150-200mm long . The 40mm just happens to sort of fit the common taper roller bearings used in many mini mills etc… ie.. 62mm outside and 40mm id.

I did buy one from apt for around £20-25 and the quality is good ,though they have a flat on one side unfortunately.

**LINK**

Just another of my daft ideas.

Don't call them daft ideas, or that means I'm in that category also ,I have them all the time

Sean

[sean logieParticipant @seanlogie69385]

Oh well first attempt boring the mt2 was wrong , note to self …. when the wife comes in for a bleither STOP!! what I’m doing 😁😉 the taper was too big .

Sean

[sean logieParticipant @seanlogie69385]

Cancel that , I managed to save thankfully. Just as well I left the spindle nose as long as I did I managed to machine of a good 1/4″ touched up the taper with the mt2 reamer and it turned out nigh on perfect . 😁

Sean

[jimmy bParticipant @jimmyb]

Good save.

Jim

[Howard LewisParticipant @howardlewis46836]

It's not the mistakes that count. It's how you recover from them!

I am grateful for Helicoils or enough "meat" to fit a repair bush!

Howard

[sean logieParticipant @seanlogie69385]

Managed to get a wee bit more done on the spindle .

[Martin DowingParticipant @martindowing58466]

I am planning to correct MK2 socket on my ML7. It is one of last jobs to be done on my old otherwise accurate lathe. To this end taper turning attachement will be deployed. Jig for holding a bigger version of Dremmel, designed to be mounted in the lathe, is now under construction. It will have dovetail slide tangentially set, so very accurate adjustments can be made. Phosphor bronze bearings which are actually not a bad fit as they are now will be professionally scraped in (I am not up to the task yet), headstock allignement will be made as close to perfect as possible (this is now not a problem for me, can do it and well) and then socket will be corrected with few tenths cut.

I will even possibly make 2 or 3 spare spindles from suitable material, all in perfect allignement, socket ground in the machine and nitrogen harden them. Recently I am studying research papers treating about cyanate bath for nitriding. These work in lower temperatures (450*C) than cyanide bath does (600-700*C) and are also substantially less toxic.

Martin

[Chris TriceParticipant @christrice43267]

Dremel did (do) a flexishaft that is cylindrical rather than the contoured one, which is much easier to clamp and mount.

[Chris TriceParticipant @christrice43267]

https://www.ebay.co.uk/itm/NEW-DREMEL-FLEX-SHAFT-ATTACHMENT-MODEL-225-T2-WITH-DRIVER-NUT-CAP-NOS-NWT/232022622513?epid=1701522023&hash=item3605a04131:g:cikAAOSwYlJW2U1U

[Author]

Posts