The turntable ring frame carries a round bale on a bale wrapper and rotates it while the film dispenser applies stretch wrap. It takes the full bale load off-centre, so the ring must stay flat and true or the bale wobbles, the film overlaps badly and the seal fails. Ningbo Ruican casts the ring frame in segments or as a one-piece ring, then machines the bearing race seats, the drive faces and the roller tracks in house so the table runs true under load.
Specifications
| Item | Value |
|---|---|
| Casting process | Water glass investment casting for large rings; silica sol investment casting for compact frames and segment joints |
| Material options | QT500-7 and QT600-3 ductile iron, HT250 gray iron, 45# carbon steel, low-alloy high-strength steel |
| Dimensional tolerance (ISO 8062-3 CT grade) | CT6-CT7 (silica sol); CT7-CT8 (water glass) |
| Machining | CNC vertical turning and large-format milling: bearing race seat facing, roller track turning, drive sprocket or gear faces, bolt circle drilling |
| Surface finish (Ra) | Ra 1.6-3.2 micrometres on race seats and roller tracks; Ra 3.2-6.3 micrometres on non-critical faces; shot blast as cast |
| Weight range | 14.0-65.0 kg per ring frame |
| Typical lead time | Tooling 35-45 days; sample parts 25-30 days; production 40-50 days |
Key features
- Bearing race seats and roller tracks machined flat and concentric to keep bale rotation smooth at full load.
- Ductile iron body absorbs the shock of a bale dropped onto the table without cracking.
- Segmented or one-piece ring designs to match your turntable diameter and transport width limits.
- Cast-in drive lugs, gear mounting pads and sensor brackets reduce secondary welding.
- Balanced rotation geometry reduces drive motor load and extends bearing and roller life.
- Machined drainage and wash-down features for silage and sticky forage conditions.
Applications
- Trailed and mounted round-bale wrappers, single and twin table
- Bale wrapper and baler combination machines
- Turntable bale handling and loading decks
- Silage bale wrapping lines at feedlots and contracting yards
- Square bale and combined round-square wrapping turntables
- Industrial rotating tables and indexing rings derived from wrapper platforms
Quality & compliance
Ring frames ship with EN 10204 3.1 material certification, spectrometer-verified melt chemistry, mechanical test coupons and hardness results from the machined race area. Dimensional reports document race seat flatness, track concentricity, bolt circle position and overall diameter, with runout checked on a rotary table or CMM. PPAP Level 3 and first article inspection documentation are available on request, and every ring is produced under IATF 16949 process control with heat-lot identification carried through machining and inspection.
FAQ
Do you cast the ring as one piece or in segments?
Both options are available. Rings up to roughly 1.4 m are usually cast and machined in one piece for the best stiffness and runout. Larger turntables are cast in two or more segments with machined joint faces and doweled connections, which keeps transport and heat treatment practical while still giving a true circular track after assembly. (52 words)
Which material works best for a turntable ring frame?
QT500-7 ductile iron is the usual choice because it combines strength, damping and impact resistance when a bale is dropped onto the table. Where the ring also carries a driven gear ring or heavy point loads, QT600-3 or low-alloy steel gives extra margin. Gray iron HT250 is used where damping and cost matter more than impact strength. (54 words)
How do you control flatness on such a large casting?
We control flatness through pattern design, controlled cooling after pouring and stress-relief heat treatment before machining, then finish the race seats and roller tracks on large-format CNC vertical turning and milling equipment in a single set-up. Flatness and runout are measured on the finished ring, and the results are reported against your drawing tolerances. (50 words)
Can you machine the drive gear or sprocket mounting faces?
Yes. The gear or sprocket mounting faces, bolt circles and dowel holes are machined in the same set-up as the race seats, which keeps the drive concentric with the rotation axis. This reduces motor load and prevents the film overlap problems caused by a turntable that speeds up and slows down during each revolution. (52 words)
What is the lead time for a new turntable ring frame?
Large ring tooling takes 35-45 days, sample parts 25-30 days and serial production 40-50 days because of size and heat treatment time. For repeat programmes we can hold pattern tooling ready and plan staged deliveries around your wrapper assembly season, with agreed safety stock for service and spare parts demand. (50 words)
Can you supply replacement rings for existing wrappers?
Yes. Send the worn ring, the drawing or a 3D scan and we will reproduce the geometry, confirm the material and supply a fully machined replacement that fits the existing rollers, bearings and drive. Because we cast to your geometry, the replacement installs without modifying the wrapper frame or the film dispenser arrangement. (50 words)
CTA
Send your turntable ring drawing, diameter and load data to Wendy She — sales@cnsandcasting.com — WhatsApp +86-13777124360 — for a cast and machined quotation, segment design advice and a tooling and delivery plan.
