Need some suggestions about a modification to a Tyme Avon lathe. I recently acquired a variable frequency inverter, to use with a spare 3-phase motor off a Startrite 352. This runs beautifully with the inverter, with a speed range from very slow up to full speed, but there are two problems to sort before I can fit it to the lathe.
1.The four step drive pulley on the Avon has a 5/8” bore, but the Startrite motor shaft is ¾ “, so ideally a new pulley is needed. According to all the power transmission suppliers so far asked, these multi-step pulleys are not a standard item, and are usually made specially for each machine manufacturer. Tyme, of course, are no more, so that's not an option. I could machine out the pulley, but would then need also to make an adaptor to refit it to the original motor if I wanted to sell the machine in original condition. Anyone know a possible source of suitable pulleys?
2.The inverter unit is fan cooled, and lathes are not dust free! The unit therefore needs some sort of enclosure that will keep out the dust, but still allow sufficient airflow to cool it. Would the RS filters that are being suggested in the thread about £3.50 dust extraction be appropriate? And would there need to be one for intake and one for exhaust, to prevent dust settling in the enclosure when the fan is not running?
Incidentally, if anyone is looking for an inverter unit, this one came from a very helpful guy in Malvern called Gavin Oseman. He buys them from factory clearances and then offers them tested and with the components to make the control boxes, on the homeworkshop model engineering website.
1.The four step drive pulley on the Avon has a 5/8” bore, but the Startrite motor shaft is ¾ “, so ideally a new pulley is needed. According to all the power transmission suppliers so far asked, these multi-step pulleys are not a standard item, and are usually made specially for each machine manufacturer. Tyme, of course, are no more, so that's not an option. I could machine out the pulley, but would then need also to make an adaptor to refit it to the original motor if I wanted to sell the machine in original condition. Anyone know a possible source of suitable pulleys?
2.The inverter unit is fan cooled, and lathes are not dust free! The unit therefore needs some sort of enclosure that will keep out the dust, but still allow sufficient airflow to cool it. Would the RS filters that are being suggested in the thread about £3.50 dust extraction be appropriate? And would there need to be one for intake and one for exhaust, to prevent dust settling in the enclosure when the fan is not running?
Incidentally, if anyone is looking for an inverter unit, this one came from a very helpful guy in Malvern called Gavin Oseman. He buys them from factory clearances and then offers them tested and with the components to make the control boxes, on the homeworkshop model engineering website.
