Chester DB7 Lathe Motor issues

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Chester DB7 Lathe Motor issues

This topic has 10 replies, 6 voices, and was last updated 9 September 2024 at 18:33 by mark costello 1.

Viewing 11 posts - 1 through 11 (of 11 total)

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4 September 2024 at 10:51 #751118
trexcarey
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@trexcarey
Guys and Gails, I have an issue with the drive on my small DB7 lathe. When I haven’t used it for a while, the motor on startup is very slow and then builds up to the speed it is set at on the VFD. Plus, it doesn’t seem to have the power it used to and stalls on some of the lightest cuts. Does anyone have a suggestion as to whether this is likely to be the motor or the VFD drive electronics?

Thanks

Andy
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4 September 2024 at 12:54 #751154
bernard towers
Participant
@bernardtowers37738
Before you dig in to the electronics check all the mechanicals for free running. And run the motor with the belt/drive off.
4 September 2024 at 13:17 #751157
trexcarey
Participant
@trexcarey
Yes the whole system all runs free
4 September 2024 at 15:57 #751194
Brian Wood
Participant
@brianwood45127
Hello Andy,

I don’t know the lathe model but it sounds to me to be the result of dry bearings that are loading the motor, added to which you say its performance once running is now feeble. It is clearly struggling.

Try an extended run with belt off to see of the motor gets hot or noisy and act accordingly.

Brian
4 September 2024 at 16:34 #751213
bernard towers
Participant
@bernardtowers37738
If its a brush motor try the brushes
4 September 2024 at 17:36 #751221
Les Jones 1
Participant
@lesjones1
Can you confirm that the version of DB7 does use a 3 phase motor and a VFD ? The only versions with variable speed I have seen have used a DC motor and speed controller.

Les.
6 September 2024 at 05:38 #751517
trexcarey
Participant
@trexcarey
Sorry yes VFD was the wrong terminology it is a DC motor by the looks of it. I think I will drag the motor out and see if there are any serviceable bits and check the bearings as the bearings on the lathe seem fine.
6 September 2024 at 10:14 #751535
Les Jones 1
Participant
@lesjones1
The only servicable parts on the motor will be the bearings and the brushes. If you connect a mains voltage 100 watt filament lamp in place of the motor it’s brightness should increase as the speed control is increased. If this happens the speed controller board is probably OK.

Les.
9 September 2024 at 08:51 #752185
trexcarey
Participant
@trexcarey
Hi Les,

Thanks for that. I have been away all weekend and will try this next week.

Andy
9 September 2024 at 10:55 #752200
Hugh Stewart-Smith 1
Participant
@hughstewart-smith1
hello Andy,

If you are still having the same problem then you’re welcome to contact us at Amadeal as we can send you a test chart which may be of help to diagnose the problem.

Hugh Amadeal Ltd
9 September 2024 at 18:33 #752300
mark costello 1
Participant
@markcostello1
WOW, excellent service.
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