Recommissioning lathe size of hole to cut for belt

[Martin NewboldParticipant @martinnewbold]

I received my unwanted Inverter drive back from APP it has a warranty card on it saying it has no fault . If anyone would like this let me know please.

[bodgeParticipant @bodge]

Hi Martin

Dont see any reason why you couldnt make the quadrant plate out of a bit of 5/8 T6 alli plate after all , all it does is hold the pinion shafts in the right place, maybe just put a small bush in where it has to swing a bit on the one shaft…………….b

[Martin NewboldParticipant @martinnewbold]

Yep Bodge hoping to drill it and to make a larger pin than the 5/16" one so marked it up hopefully there is enough metal to position it and loose the mess created by drill breaking and in correct position from diagram. Will let you know how this goes on.

[Swarf MakerParticipant @swarfmaker85383]

Martin, you have a pm.

[Martin NewboldParticipant @martinnewbold]

Today I went to friends as my lathe issues are still not sorted and the company is being worse than useless as usual a letter is on way to them as am getting rather fed up with their rubbish. The Quadrant was re-drilled with a 14 mm hole and this covered all of the damage. After drilling this it was noticeable that when a rod was pushed through this was not at right angles to the face. A quick check indicated that the faces of the casting are not parallel despite being milled down. This was refaced and the hole expanded to 15 mm a Stud was made up that could be bolted from another side. A nut then was made to fit . And the whole assembly was trued on the lathe.

[Martin NewboldParticipant @martinnewbold]

Have worked out that if I make a brass bearing I can pull the quadrant forward on to that and push my 1/4 i need from the rear. This is what it looks like off . Still needs pinning and a handle and knob but the end is in sight.

[Martin NewboldParticipant @martinnewbold]

is it not it amazing you can make something like this in less time than you can resolve a motor and inverter purchase!

[Martin NewboldParticipant @martinnewbold]

Here is the pins holding gears from rear

[Martin NewboldParticipant @martinnewbold]

More parts made for tumbler today letter sent to motor and drive factor. Still meed to cut slot and teeth in the handle . Made a brass bush for quadrant , as thought this was a better Idea . Had the entire unit on the lathe and had gears all turning by hand nicely .

[Martin NewboldParticipant @martinnewbold]

Well the Tumber is moving forward and only a few jobs left

I still have to pin the Base I have pinned handle not in this photo with a roll pin . I am not happy with the roll pins i bought so am looking for some better ones. Whilst looking at the position of the gears I noticed that the sadle gear s where not holding in place. I noticed that this was because there was a crack in the bracket which prevented the bolt from locking up the bracket:

This was a bit of a blow as the crack is from the casting material presumably the slag was in it when it was founded and cast. I have been thinking about this design and have to wonder if it not a good design either. I am thinking two bolts would be better like a piston con rod:

Anyone have any thoughts please?

[Martin NewboldParticipant @martinnewbold]

built bracket for front cover today. Its not the best and has to be removed for tapering but seems to hold Ok. Will attempt the rear at some point still no news about motor .

Edited By Martin Newbold on 31/05/2016 18:06:12

[Martin NewboldParticipant @martinnewbold]

Had a bit more luck today . Was trying to locate a position for the rear bracket that would encompass the front off side . This did not go to well however . The bracket i made I cut in half and made into the other cover bracket. This is now bolted firmly in place unlike the front. I slotted the front bracket so that the lathe head could still be rotated and the cover would remain in the correct orientation :

[Martin NewboldParticipant @martinnewbold]

Well covers are finished to fit the front two gears. They came from an ML4 but had no clue how they fitted so used some artistic license here is what they look like.

[Martin NewboldParticipant @martinnewbold]

Close up of two of brackets . The rear is really good as it holds tumbler in to arm

The front is just made out of iron

[Ian PParticipant @ianp]

Posted by Martin Newbold on 28/05/2016 15:21:06:

Well the Tumber is moving forward and only a few jobs left

I still have to pin the Base I have pinned handle not in this photo with a roll pin . I am not happy with the roll pins i bought so am looking for some better ones. Whilst looking at the position of the gears I noticed that the sadle gear s where not holding in place. I noticed that this was because there was a crack in the bracket which prevented the bolt from locking up the bracket:

This was a bit of a blow as the crack is from the casting material presumably the slag was in it when it was founded and cast. I have been thinking about this design and have to wonder if it not a good design either. I am thinking two bolts would be better like a piston con rod:

Anyone have any thoughts please?

The crack in the casting is more the result of bad design rather than just over tightening. The pinch bolt should be much closer to the diameter of the bore. The bolts purpose is to reduce the circumference to achieve the clamping action so the closer it is to the bore the more effective it is. Being positioned so far out introduces a bending moment in the casting rather than pure tension.

Having the casting thicker (at the point it broke) than the rest of the 'band' round the shaft would have helped too. It might be an optical illusion but it appears that where it broke was actually the thinnest part.

Your proposed design will work just as well, its just a matter of however you want to make it.

Ian P

[Martin NewboldParticipant @martinnewbold]

Well Drummond Reverse Tumbler worked ok https://youtu.be/KtnjwN0SoF8 gears turning well by hand without the backing plate fixed as i'm drilling it for pin soon for the back so will drill and mark but looks ok so far

 

 

Edited By Martin Newbold on 05/06/2016 14:20:24

[Martin NewboldParticipant @martinnewbold]

Finally got pin in to outer this evening, just need spring. Have not fathomed what last slot is for yet as only front two seem useful.

[Martin NewboldParticipant @martinnewbold]

Finally got pin in outer casting.

[Martin NewboldParticipant @martinnewbold]

Aquired a single phase motor today 1hp Vroom. This was first test with wrong pulleys which were not V pulleys on motor

[Neil WyattModerator @neilwyatt]

Posted by Martin Newbold on 03/06/2016 18:40:15:

 

AIEE!!! Key in chuck alert!

We'll have a new Prime Minister before the angry posts and upset emails to Scribe a Line come to a halt!

Edited By Neil Wyatt on 27/06/2016 19:19:20

[Martin NewboldParticipant @martinnewbold]

Recieved new bracket for gears over weekend and had to mill 1mm of inside to get it to fit did this today and tried mounting really not sure what RPM is is but its all connected . I was hoping to turn 16mm to 19mm sleave up to try it out but flat pulley would just not hold on the belt long enough.

[Martin NewboldParticipant @martinnewbold]

HI EVERONE

New 1.5hp is running well now and revolving right way round

[Martin NewboldParticipant @martinnewbold]

Well Had a bit of trouble today but worked out rpm for lathe is 750rpm is this to much ?

**LINK**

[Martin NewboldParticipant @martinnewbold]

Ok everyone first test with the newly made reverse tumbler. I had to replace roll pin with a larger 4mm one instead of 3mm to stop the handle rocking . The gearing is unknown for thread cutting at moment as I just wanted to see if it would motorize the saddle which it seemed to do . I don't know if it has built in stops yet to stop at end of the bed

[Martin NewboldParticipant @martinnewbold]

Well after first tests with the reverse tumbler it was apparant th elathe has no auto stops be ware so you dont break a gear pin I re drilled my roll pin hole in the reverse tumbler to take 4mm pin as was noticing that the back section was movig slightly preventing neutral or no gear selection. Whith this done I made some new spacers to space the gears in line

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