Starting to build fast speed gear for Drummaond Lathe Rebuild

[Martin NewboldParticipant @martinnewbold]

I have started buying parts for my high speed lathe rpm for my Drumond.

Since installing this i have had issues with a RUBBISH 3PH INVERTER AND RUBBISH MOTOR AND HAD NO REFUND FROM THE SUPPLIER FOR THE MOTOR WHICH HAS BEEN DESTROYED BEWARE WHO YOU PURCHASE THIS FROM.

I have sicne settled on a single phase motor which runs too fast for high speed and have started buying parts to make this . I have purchased two additional pulleys a 4" and a 5" and some new bearings

I cannot seem to find a bearing guide so am going to make my own out of angle iron and tool steel.

[Martin NewboldParticipant @martinnewbold]

Lathe Rebuild Drummond

[Martin NewboldParticipant @martinnewbold]

Hopefully some more bits will arrive soon. This will be much nicer that the lay shaft as will live under the lathe

[MuzzerParticipant @muzzer]

Apart from the poor service from the supplier, what brand of VFD and motor were they? Sounds very frustrating so best avoided from what you say.

[Nicholas FarrParticipant @nicholasfarr14254]

Posted by Martin Newbold on 04/01/2017 16:46:57:

I have started buying parts for my high speed lathe rpm for my Drumond.

Since installing this i have had issues with a RUBBISH 3PH INVERTER AND RUBBISH MOTOR AND HAD NO REFUND FROM THE SUPPLIER FOR THE MOTOR WHICH HAS BEEN DESTROYED BEWARE WHO YOU PURCHASE THIS FROM.

I have sicne settled on a single phase motor which runs too fast for high speed and have started buying parts to make this . I have purchased two additional pulleys a 4" and a 5" and some new bearings

I cannot seem to find a bearing guide so am going to make my own out of angle iron and tool steel.

Hi Martin, I wouldn't go to the expense of tool steel, bright mild steel square should be perfectly OK or even square hollow section (Box) on this type of bearing and it can be stich welded to your angle iron or even tapped and screwed. Put one in each channel on the bearing housing, so that they slide easy without undue slop. There should be no contact between the outer edges of the channels of the housing and the frame.

Regards Nick.

[Martin NewboldParticipant @martinnewbold]

Thanks Muszzer , Nicholas

Yes very frustrating but wont make same mistake again buying inverter technology . The rails are looking harder to make than i thought through lack of materials i need a larger section than 25 x 15 . This is why I thought of tool steel I am presuming 25 x 25mm. I was going to use angle to make the box up and bolt rails to it with a long piece of threaded bar to pull it down it wont need much force as the weight of the motor is on a counter balance pulling on lower belt too. do you think its worth making it without threaded bar in first case. How do you manufacture a fast thread is it just a coarse one?

Cheers Martin.

[Nicholas FarrParticipant @nicholasfarr14254]

Posted by Martin Newbold on 06/01/2017 10:22:52:

Thanks Muszzer , Nicholas

Yes very frustrating but wont make same mistake again buying inverter technology . The rails are looking harder to make than i thought through lack of materials i need a larger section than 25 x 15 . This is why I thought of tool steel I am presuming 25 x 25mm. I was going to use angle to make the box up and bolt rails to it with a long piece of threaded bar to pull it down it wont need much force as the weight of the motor is on a counter balance pulling on lower belt too. do you think its worth making it without threaded bar in first case. How do you manufacture a fast thread is it just a coarse one?

Cheers Martin.

Hi Martin, not understanding your ideas, but have a look at this **LINK** which is the general type of set up for these bearings, which are nearly always bespoke.

Regards Nick.

[BazyleParticipant @bazyle]

I'm hoping that when you mention 'tool steel' you mean what we call mild steel as in ready to be machined drilled etc. Tool steel will be impossible to drill or cut as it is the stuff that has to be ground into….. tools.

If you are needing sections of 25mm square then you probably should use tube. Solid is going to be heavy and expensive.

[Nick HulmeParticipant @nickhulme30114]

Posted by Bazyle on 07/01/2017 13:59:23:

Tool steel will be impossible to drill or cut as it is the stuff that has to be ground into….. tools.

I make parts in 01 Tool Steel and D2 Tool Steel, I buy both in fairly free machining annealed states, they turn and mill very nicely. Once I've heat treated them they don't machine so well

– Nick

[BazyleParticipant @bazyle]

Ah yes , I'm being an old fashioned model engineer only using tools steel to refer to HSS. The varieties available to MEs is now rather wider than the ground flat Kennions stocked.

[Nick HulmeParticipant @nickhulme30114]

It's just not that simple –

http://www.buffaloprecision.com/data_sheets/dsm2hs.htm

– Nick

[Martin NewboldParticipant @martinnewbold]

More parts arrived . Thanks Nick for the datasheet

[Martin NewboldParticipant @martinnewbold]

Managed to get my 3/4" shaft made so it was .747" to take bearings and pulleys today. Its starting to take shape I am still shoppig for 1m of 15mm x15mm for tracks to run this on

[Martin NewboldParticipant @martinnewbold]

Posted by Bazyle on 07/01/2017 13:59:23:

I'm hoping that when you mention 'tool steel' you mean what we call mild steel as in ready to be machined drilled etc. Tool steel will be impossible to drill or cut as it is the stuff that has to be ground into….. tools.

If you are needing sections of 25mm square then you probably should use tube. Solid is going to be heavy and expensive.

Sorry the technical drawings were not good the runners need to be 15mm square so not quite so heavy as will be quite short but will try to get 1m

[Martin NewboldParticipant @martinnewbold]

Posted by Nicholas Farr on 07/01/2017 13:24:43:

Posted by Martin Newbold on 06/01/2017 10:22:52:

Thanks Muszzer , Nicholas

Yes very frustrating but wont make same mistake again buying inverter technology . The rails are looking harder to make than i thought through lack of materials i need a larger section than 25 x 15 . This is why I thought of tool steel I am presuming 25 x 25mm. I was going to use angle to make the box up and bolt rails to it with a long piece of threaded bar to pull it down it wont need much force as the weight of the motor is on a counter balance pulling on lower belt too. do you think its worth making it without threaded bar in first case. How do you manufacture a fast thread is it just a coarse one?

Cheers Martin.

Hi Martin, not understanding your ideas, but have a look at this **LINK** which is the general type of set up for these bearings, which are nearly always bespoke.

Regards Nick.

Hi Nick am going to make a box out of angle to put my rail in similar to this one but with differant ends as mine needs to hang from under the lathe surface on a bracket i made up.

 

I am unsure if I wil need to construct lower threaded piece as gravity and the weight of my motor will pull this downward. but will make boxes up with this in mind. It might be that the pull wil be so much that the screws will have to go on it to keep it balanced

Edited By Martin Newbold on 09/01/2017 17:46:24

[Martin NewboldParticipant @martinnewbold]

First try at rough placement

[Martin NewboldParticipant @martinnewbold]

Got a bit further

[Martin NewboldParticipant @martinnewbold]

Well i drilled bars and re-ground one which was sticking

[Martin NewboldParticipant @martinnewbold]

Well I had to buy new angle as the B&Q angle iron lol now mild steel was not regular or a right angle inside and out. This mean all the work i had done was rubbish. I have purchased proper angle from a wholesale stock dealer and have got back to were i was . I have decided to use 3/4 gate eyes for the winding mechanism and have some on order . I still have to drill top plate for old mounting bearing holes and have a dry run with it cramped up before both are welded.

[Martin NewboldParticipant @martinnewbold]

I made the securing pieces to bolt under top and roughly cramped together to see if it all slides .

[Neil WyattModerator @neilwyatt]

Posted by Martin Newbold on 15/02/2017 16:11:07:

Well I had to buy new angle as the B&Q angle iron lol now mild steel was not regular or a right angle inside and out.

B&Q angle iron is perfectly good as angle iron. Rolled angle iron isn't a precision product, up to 100mm leg length it can be up to 1mm out of square either way.

[Nicholas FarrParticipant @nicholasfarr14254]

Posted by Neil Wyatt on 16/02/2017 14:20:49:

Posted by Martin Newbold on 15/02/2017 16:11:07:

Well I had to buy new angle as the B&Q angle iron lol now mild steel was not regular or a right angle inside and out.

B&Q angle iron is perfectly good as angle iron. Rolled angle iron isn't a precision product, up to 100mm leg length it can be up to 1mm out of square either way.

Hi, and it very often is.

Regards Nick.

[Neil WyattModerator @neilwyatt]

Yes but angle iron is really just a structural product meant for things like keeping up garage roofs and intended to be used with similar tolerances as wood or concrete.

Just because WE use it for other things doesn't mean we can expect it to be to the same standard as bright drawn bar, for example. If we need more accuracy, we need to cough up the extra for bright drawn angle.

[Martin NewboldParticipant @martinnewbold]

Lol the profile was not good at all but ok for simple jobs have fabricated out of proper right angle and have it working in rough mock up pending new rod. The B&Q steel not iron was thicker at ends and narrow in centre the items I had was not right angles inside or out. Perhaps they have changed this and thier new stock is different. I did not go back but brought else where.

First mock up

[Martin NewboldParticipant @martinnewbold]

Had not cleaned up welding so the seatings were not seated properly forcing an odd angle . Much better now they have been cleaned up . My maths has been thus

n1 = 1600rpm, d1 (Drive)=25mm, d2 (Pulley drive )=130mm d3= 100mm d4 (on lathe ) =130mm

n4=(n1 *d1*d3)/(d2 * d4)

n4 = (1600 x 25 x 130)/(100 x130)

n4 = 400rpm

I just need a longer 3/4 silver steel bar around 12" long as he width is wider than my original pulley bar

Edited By Martin Newbold on 17/02/2017 16:59:37

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