I want to attach a binder to my singer 111g155, so i ordered a couple of screws to fit the two threaded holes to the rear and right of the foot. When i tried to fit them they wouldn't fit,even though the supplier assured me that they would fit. So i checked the thread of the screws and found that they were 6-40UNF but the two tapped holes were M3 ( metric 3mm). Also i checked the rest of the threaded holes on the bed and they were M5 (metric 5mm).
Can somebody tell me when singer changed to metric threads ,or is it because my machine is made in Germany?
Also i needed to replace the two helical timing gears, so i ordered two new ones from a supplier. But when they came and i tried to fit them they wouldn't fit. So i checked them and found that the new ones were metric; the larger gear had a diameter of 44mm and a 1Module metric gear form, but the old one had a diameter of 43.57mm and a 26DP gear form (imperial). As the gear centers are fixed I couldn't get them to mesh properly so wouldn't fit.
Has anybody else had the same problem with the timing gears? Does anybody know if and when singer changed to metric gears?
When i contacted the supplier, he said that he had never had problems with these gears before and couldn't explain it. All I can think is that the new batch of gears has been made to the wrong spec,as they are virtually identical.
hope somebody can enlighten me
thanks