The 3420 is National's 7" handheld electric grinder, running on 115 V. It comes with a loop handle for confined spaces and a polyurethane convertible dust shroud that lets it work all the way up to the edge, with a vacuum port to hook up a dust collector.
Specifications
Specs from National's 3420 product page and the operating manual (402586 Rev A).
| Spec | Value |
|---|---|
| Disk size | 7" (18 cm); takes 5/8" arbor disks up to 7" |
| Length | 19" (48.26 cm) |
| Weight | 16 lb (7.3 kg) |
| RPM | 6,600; not variable speed |
| Voltage | 115 V, 60 Hz |
| Amps | 15 |
| Dust shroud | 3440 polyurethane convertible dust shroud |
| Dust collection | Vacuum dust port; National's DL2000 page lists the 3420 as compatible |
Maintenance schedule
From National's 3420 operating manual (402586 Rev A). The manual gives no hour-based intervals; inspection and parts replacement are left to a service center.
| Interval | What to do |
|---|---|
| Before each use | Inspect the wheel for chips and cracks and remove bad wheels; run the tool at no load for one minute, held away from people |
| During use | Blow compressed air through the rear ventilation slots regularly and frequently |
Sources
Everything on this page comes from National Flooring Equipment's own published material.
