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Plasma cutter pilot arc versus a contact start

Updated: October 2026

The plate is painted, rusty or mesh, and a contact torch will not start until you grind a bright patch. A plasma cutter pilot arc is a start method, not a thickness upgrade, and high frequency is not blowback. This page says which of the four amazon.co.uk listings is contact and which are written as non-touch. Prices are from 19 October 2026. Peter F., the DIY & tools editor, did not fire these torches in a lab. A qualifying purchase can earn a commission at no extra cost to you. The table is on the [plasma cutter comparison](/hub/cutting-tools/plasma-cutter).

The plate is painted, rusty or mesh, and a contact torch will not start until you grind a bright patch. A plasma cutter pilot arc is a start method, not a thickness upgrade, and high frequency is not blowback.

Our top picks

SPRIGHOLLY SPRIGHOLLY CUT50L plasma cutter

Best overall

SPRIGHOLLY SPRIGHOLLY CUT50L plasma cutter
10.0/10about £67.83
View offer
Reboot Reboot 45 A plasma cutter

Best value

Reboot Reboot 45 A plasma cutter
9.0/10about £103.67
View offer
SPRIGHOLLY SPRIGHOLLY CUT50 contact plasma cutter

Alternative

SPRIGHOLLY SPRIGHOLLY CUT50 contact plasma cutter
6.4/10about £99.73
View offer
On this page
  1. 1.Contact start needs bare metal
  2. 2.What pilot arc means on these three boxes
  3. 3.High frequency is not blowback
  4. 4.The earth clamp is still a contact

Contact start needs bare metal

A contact start needs the nozzle on bright metal. Paint, rust, mill scale and zinc sit in the way. Mesh is worse: the tip falls into a hole. A rusty chassis patch or a painted lintel is the wrong job for a contact listing, even when the amps look the same. In this set that listing is the SPRIGHOLLY CUT50 at £99.73. The page records a contact / direct arc start. The title also says high frequency. Those are two claims, not two proven modes. amazon.co.uk shows 3.2 from 3 reviews. One describes touch start as easy, including 6 mm on the lowest setting: clean steel, tip down. Who should buy it sits on the best plasma cutter page. If the steel is not bright, this PT31 will hunt. The earth clamp is a second contact. Paint under the clamp is a false return.

What pilot arc means on these three boxes

Pilot arc lets a small arc form in the torch before it transfers. Listings sell it for rust, paint and mesh. It does not add millimetres. Clean-cut lines still sit at 8–10 mm. The CUT50L is high-frequency non-contact, £67.83, 5.0 from 2 reviews. One recommends that start for rust, paint and CNC sheet. Mesh on this box is a listing claim, not a two-review result. The Reboot 45 A is non-touch, £103.67, 4.5 from 5. Those texts describe cuts, not blowback. The CUT60L PRO is £159.99, 4.0 from 7. The title says non-touch and one bullet says contact. One review praises the pilot on paint; another lost the arc on 3 mm and would not cut 8 mm or 10 mm.
SPRIGHOLLY SPRIGHOLLY CUT50L plasma cutter

Testsieger

SPRIGHOLLY SPRIGHOLLY CUT50L plasma cutter
10.0/10about £67.83
View offer

High frequency is not blowback

High frequency and blowback are two ways to light a pilot. Jasic's UK note says an HF spark-gap start can interfere with computers and CNC, which is why an HF-free blow-apart torch exists. The words are not interchangeable. None of these four prints blowback or non-HF. The CUT50L is high-frequency non-contact. The contact CUT50 title says high frequency as well as contact. Reboot and the CUT60L PRO say pilot or non-touch and stop there. A different Reboot listing that said non-HF for ECUs, CNC and workshop computers is not in this set. Do not call any of these boxes CNC-safe, and do not say HF will damage an ECU. That claim sat on a listing that is not here. Next to a workshop PC or a vehicle ECU, this folder has no printed HF-free option. LinuxCNC hobby notes prefer blowback near PCs because HF radiates EMI. That is a reason to read the label, not to invent blowback on a title that does not use the word.

The earth clamp is still a contact

A non-touch torch does not make the earth clamp non-touch. Paint under the clamp drops the pilot as surely as a contact start on rust. Grind a coin-sized patch even when the AG60 never touches the plate. Mesh is claimed on the CUT50L. Two reviews do not prove it. Keep the clamp on solid keep-piece steel, not on a waving offcut. The first cut is still earth, dry air, visor, then travel, which is on how to use a plasma cutter. Pilot arc is not a 16 mm upgrade, and high frequency is not blowback.

Common questions

What is the difference between contact start and pilot arc?
Contact needs the nozzle on bare metal. Pilot arc forms in the torch first. Only the CUT50 is listed as contact. The other three are written as non-touch. Clean cut stays at 8–10 mm either way.
Can a contact cutter start on paint?
Not reliably. Paint, rust and zinc sit between the nozzle and the steel. The easy-start notes are about bare plate, including 6 mm, not a painted lintel.
Is high frequency the same thing as pilot arc?
No. Pilot arc is the non-touch start. High frequency is one way to light it. Blowback is another. Jasic's note exists because HF can interfere with computers and CNC.
Which of these four is contact-only?
The CUT50, at £99.73, PT31, contact / direct arc, though the title also says high frequency. The CUT60L PRO contact bullet is a wording fight, not a second contact machine.
Will an HF cutter upset a workshop PC or CNC?
Jasic explains why HF-free starts exist near electronics. None of these four prints blowback or non-HF. Do not call them CNC-safe. This folder has no HF-free listing.
Do I still grind a clean earth point?
Yes. The earth clamp is a contact even when the torch is not. Keep it on solid keep-piece steel. Two reviews do not prove the CUT50L mesh claim.

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How to use a plasma cutter for the first garage cut

Sources

Public UK sources and the amazon.co.uk listings in this set, checked on 19 October 2026.

  1. HSE WL15: Welding fume (retrieved 19 October 2026)
  2. HSE: Cutting metals and similar fume (retrieved 19 October 2026)
  3. HSE: Noise (retrieved 19 October 2026)
  4. Control of Noise at Work Regulations 2005, regulation 7 (retrieved 19 October 2026)
  5. Electrical Equipment (Safety) Regulations 2016, regulation 35 (retrieved 19 October 2026)
  6. OPSS: Vevor plasma cutter CUT-40, 30 June 2023 (retrieved 19 October 2026)
  7. ESAB UK: Tips for buying a manual plasma cutter (retrieved 19 October 2026)
  8. R-Tech: Plasma cutting FAQs (retrieved 19 October 2026)