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Centec raising block

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Gary Wooding03/04/2019 18:35:20
572 forum posts
137 photos

Martin,

You don't need a raising block if you don't have a Vertical Head.

These pictures show how the long block is used.

Long block retractedLong block extended

Frank Gorse03/04/2019 18:59:43
26 forum posts

Thanks to all for your input. Gary it was your post that I remember seeing some while ago, I hadn’t realised they were made of aluminium ,which would make the milling a bit less daunting,but still unfortunately too long to make on the machine itself and I don’t have access to a bigger one. One advantage of my original plan was that the dovetail on top need not be the whole length,just enough to park the VH so 14” or so would be fine. However that suggestion doesn’t seem to have found much favour!

martin perman03/04/2019 20:40:23
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1636 forum posts
67 photos
Posted by Gary Wooding on 03/04/2019 18:35:20:

Martin,

You don't need a raising block if you don't have a Vertical Head.

These pictures show how the long block is used.

Long block retractedLong block extended

Gary,

Thanks for that and I have one more question, when I bought the mill it came with an electric grinding spindle which from memory fits, I say memory because it sits inside a stand I made and hasnt seen the light of day for a while,, where the vertical spindle fits, would this need a raising block.

Martin P

Gary Wooding04/04/2019 07:38:49
572 forum posts
137 photos
Posted by martin perman on 03/04/2019 20:40:23:d

Thanks for that and I have one more question, when I bought the mill it came with an electric grinding spindle which from memory fits, I say memory because it sits inside a stand I made and hasnt seen the light of day for a while,, where the vertical spindle fits, would this need a raising block.

Martin P

Sorry Martin,

I can't help; I've never seen a grinding spindle.

The only purpose of a raising block is to provide more headroom, or space, between the table and the VH spindle.

Paul White 304/04/2019 08:53:07
92 forum posts
17 photos

Gary,

I must disagree with your "only purpose for the block" statement . My reason for making one was to change from vertical to horizontal configuration without taking off the very heavy head. This is perhaps what the OP was thinking.

Paul White 304/04/2019 09:09:22
92 forum posts
17 photos

Dave Halford.

Your proposed - push back and clamp is the process I use, but had not been told that I couldn't!

Gary Wooding04/04/2019 09:54:09
572 forum posts
137 photos
Posted by Paul White 3 on 04/04/2019 08:53:07:

Gary,

I must disagree with your "only purpose for the block" statement . My reason for making one was to change from vertical to horizontal configuration without taking off the very heavy head. This is perhaps what the OP was thinking.

Good point Paul.

Frank Gorse04/04/2019 10:11:17
26 forum posts

Paul,Gary, Dave,

yes,the ability to use either mode of milling without troubling the local crane hire firm was the original motivation. Extra capacity is a welcome bonus of course.

RMA05/04/2019 16:29:18
162 forum posts

My 2A came with a modified overarm made from a long block of aluminium. I don't understand why a dovetail wasn't machined in the top and thereby making it a raising block while they were at it. I would like to do this if I can get someone at my club to machine the dovetail. Does anyone know where I can get two clamps?

The machine came from the Hornby tool room, but I don't know when the mod was done.

Dave Halford06/04/2019 17:05:54
439 forum posts
4 photos
Posted by Paul White 3 on 04/04/2019 09:09:22:

Dave Halford.

Your proposed - push back and clamp is the process I use, but had not been told that I couldn't!

Hi Paul,

It's one of those re-tram moments people like to avoid, personally I don't like the idea of the VH hanging that far forward and I just KNOW I'd headbutt the thing even with the head swung horizontal.

RMA08/04/2019 10:29:10
162 forum posts

Yes, I was thinking that. I think I would be head banging it all the time! Obviously to slide the head right back it would have to be turned through 90 degrees, does any oil come out?

Frank Gorse08/04/2019 17:01:52
26 forum posts

Somebody suggested drilling and reaming for a taper pin through the round bit to ease the business of resetting after the head has been tilted,can’t see why that wouldn’t work but I haven’t done it (yet.)

Brian H23/06/2019 20:18:27
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1194 forum posts
87 photos

Without wishing to hijack this thread but can someone tell me what the overall height is of a Centec with the raising block and vertical head?

Brian

Dave Halford23/06/2019 20:31:00
439 forum posts
4 photos

If you mean table clearance Brian.

2A - longitudinal 9", cross traverse 4.5", vertical 6"
2B - longitudinal 14" (less 1.25" with power feed) cross traverse 5", vertical 9.5"

+ three or four inches depending on the block,

With collets as a cutter holder add another 2" or so again

not done it yet23/06/2019 21:32:07
3246 forum posts
11 photos

Try this thread:

**LINK**

I think my riser block is 120mm. Any height, within reason, can be chosen.

Dimensions don’t take into account head-space needed for drawbar removal.

Gary Wooding23/06/2019 22:01:35
572 forum posts
137 photos

Of the 20 or so raising blocks I've made, 2 were 4" and all the rest were 4.5".

Brian H23/06/2019 22:18:35
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1194 forum posts
87 photos

Thanks for the replies Dave an Gary, what I was after was the total height of the machine, to check if one would fit in my workshop.

Brian

peak423/06/2019 22:41:06
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813 forum posts
67 photos
Posted by Gary Wooding on 23/06/2019 22:01:35:

Of the 20 or so raising blocks I've made, 2 were 4" and all the rest were 4.5".

Do you have any plans to make any more Gary; I don't think Tony from lathes.co.uk is intending to commission another batch.

Thanks

Bill

Gary Wooding24/06/2019 07:50:52
572 forum posts
137 photos

Brian.

The overall height of my 2B, with the drawbar in place, is, as near as I can measure it, 67" or 170cm. The drawbar is 12" (30.5cm) long.

Bill.

Sorry, I have no plans to make any more raising blocks..

not done it yet24/06/2019 08:38:18
3246 forum posts
11 photos
Posted by Brian H on 23/06/2019 22:18:35:

Thanks for the replies Dave an Gary, what I was after was the total height of the machine, to check if one would fit in my workshop.

Brian

You needed to take heed of my reply. All the main measurements are shown. Both the 2A and 2B models (which, unsurprisingly, are different).

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