fusible belt making

[Henry RancourtParticipant @henryrancourt22682]

I used U bolts because I think it is a stronger setup than mounting a motor to an L type stand via the threaded holes in the face plate of the motor. I’ve disassembled a few motors and found that the round flange section of the face plate, that slides into the motor body, was only about 1/8″ wide. So even though there might be four screws securing the stand to the motor face plate, my motor has only two screws holding the face plate to the motor body. So, in my case it seems two U bolts provide stronger setup than a setup based two screws holding the face plate to the motor.

[egaParticipant @ega]

I am currently making the mini-drill attachment for my UPT, plan to use a motor with a drive pulley of about 1″ diameter and wonder whether a fused belt will serve.

I would appreciate an informed recommendation for the appropriate type and size of belting.

[Henry RancourtParticipant @henryrancourt22682]

It depends on the type of the pulleys. Photos would help to get a good answer.

[bernard towersParticipant @bernardtowers37738]

My UPT uses 1/4″ belting in the original guise that is the motor is mounted on the baseboard with the belt going vertcally to two jockey pulleys which in turn sends it via a right angle bend to the drill head pulley. I built it 35 plus years ago and has performed brilliantly all of that time. Over time I have completed all of the accessories with various tap/die holders and punch/stake holders but it is the tap holders that seem to get used the most which is now done by ER16 holder with tapping collets.

[Henry RancourtParticipant @henryrancourt22682]

What is a UPT?

[bernard towersParticipant @bernardtowers37738]

George Thomas Universal Pillar Tool

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Henry, I guess it means a universal pillar Tool.

UPT

Regards Nick.

[DellParticipant @dell]

I have never had much success with polyurethane belting so I use optibelt 5X3mm belts on my Pultra P type & I know it means stripping headstock to replace it but it’s good to strip & clean the headstock occasionally anyway & the belt lasts for ages.

Dell

https://simplybearings.co.uk/shop/p680015/Optibelt-VB-5×600-Li-Cogged-Classical-5mm-Wide-3mm-Deep-V-Belt/product_info.html

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, Bernard beat me, however, you could call mine a DPPT, (Dual purpose pillar tool) as it can be used for drilling or tapping, and by simply removing the belt. which happens to be a big “O” ring, the knurled part of the belt pulley on the quill, can then be used for tapping with small taps.

It was made from a drill that had the jockey pullies missing. The pillar had a spring inside it, which held the drilling assembly up, I removed the spring and fitted a counter balance arrangement, which makes it easy when using small delicate taps.

Regards Nick.

[bernard towersParticipant @bernardtowers37738]

That looks like a nice sturdy bit of kit and a tiny footprint as well

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Bernard, thanks, yes it is very sturdy and quite heavy, I can’t remember how much it cost me, but it wasn’t a lot of money, The photo below shows what it looked like when I got it home,

I did a write-up about it, which is in MEW No. 238, Feb 2016.

Regards Nick.

[egaParticipant @ega]

I sympathise with anyone confronted with an unfamiliar TLA (three letter abbreviation); today, however, a quick online search often gives the answer.

My UPT will have the standard steel 40 degree pulleys as per GHT’s design but the motor pulley is likely to be 1″ diameter or less and I was doubtful about the reliability of a fused joint.

Thanks to those who gave helpful pointers.

bernard towers: I imagine that ER collets were not available in GHT’s day; they certainly grip the hard shank of a tap better than a drill chuck. Do the ER16 “tapping collets” you mention actually grip the square on the tap?

 

[Michael GilliganParticipant @michaelgilligan61133]

For the purpose of TLA-busting:

.

.

MichaelG.

[egaParticipant @ega]

Thanks, MichaelG.

cf also Workshop Techniques, the revised version edited by William Bennett.

[bernard towersParticipant @bernardtowers37738]

yes the collets grip the shaft but the drive is on the square i believe that the collets are called EHR16

[bernard towersParticipant @bernardtowers37738]

sorry it looks loike its ERG16

[egaParticipant @ega]

Thanks – I see Cutwel do these in a range of sizes. Rather more costly than the standard collet and, presumably, intended for a standard size tap square but no doubt work well.

[bernard towersParticipant @bernardtowers37738]

try Ali ???????

[Henry Rancourt]

On Henry Rancourt Said:

It depends on the type of the pulleys. Photos would help to get a good answer.

Seems like you guys know that, for round belts, trapezoidal pulleys provide the most power transmission to the spindle. And, from what I’ve read on pulley manufacturers sites, round pulleys should only be used for direction control. And for me the fusible belt works great and, based on other postings, seem to last.

[vic neweyParticipant @vicnewey60017]

I have three fusible belts on one of my lathes, one of the belts has to be joined in situ as it involves a heavy overhead shaft. I used a candle flame 🙂set in a suitable place and then thread the belt loosely over both shafts and hold one end in the flame for a few seconds and then put the ends together and hold steady for a minute or so. After practice l find it easy now and find they never break under high tension when being pulled onto the pulleys.

A third round belt is at the tailstock end but that belt can be joined on the bench. the flat belt, slackened off in this photo is also joined in situ using Gorilla glue as a major dismantle job has to be avoided

[renardiere7Participant @renardiere7]

Looks like a very well equipped Pittler. Lovely.

[renardiere7]

On renardiere7 Said:

Looks like a very well equipped Pittler. Lovely.

Yes, it’s a 24″ C3 and is cutting a coarse spiral on that photo, do you have one? I have made a number of videos of the lathe in action

[ega]

On ega Said:

I sympathise with anyone confronted with an unfamiliar TLA (three letter abbreviation); today, however, a quick online search often gives the answer.

…

My employer mandated acronyms and initialisations be spelt out in full on first usage, or else. There were a few exceptions, I recall only BBC, NATO, MP, and VAT.

On a writing course given by a real martinet failure to follow the rule was denounced as CBA. “Means you ***** Can’t Be Ars*d”, the instructor raged. The man often inserted expletives mid-word as in “tech-effing-nology”, not easy to do!  Impressive, except I’ve forgotten everything else he said.

🙂

Dave

[Author]

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